Any other breeds I should be looking at?

I'm trying to narrow down a list of potential breeds for my next dog, I have a few breeds I am looking at, but was wondering if there are any other suggestions.

What I'm looking for:
-generally less than 50 pounds
-not a really 'sharp' dog, more laid back and easy going
-known for being good with both humans and other dogs
-versatile, I have a lot of plans (flyball, agility, tracking, etc.)
-enjoys a fair amount and a variety of exercise (I do a lot of hiking, roller blading, biking)
-but at the same time doesn't need hours upon hours of exercise each day
-eager to please
-off-leash reliability is a huge plus
-shedding doesn't matter, I have corgis

I think that's everything (I'll add on if I forgot something).

Here are the breeds I am currently looking at:
Australian Shepherd
Shetland Sheepdog
Golden Retriever
Brittany (worried about exercise requirements)
English Cocker Spaniel

I probably won't be getting another dog for a few years, but I'd like to foster whichever breed I decide on in the next few years.

TIA

I don't think a Brittany would be any worse than an Aussie... The ones I've known tended to pretty sane, although they were hunting dogs, they ran around, listened, and then went home and played nice, without bouncing off any walls.

German Shorthaired Pointer. Females shouldn't be too much over 50lbs.

Weimeimer. A bit big but they might work

I've not been impressed with any Brittany I've ever met, show or hunting...they, like most hunting dogs it seems, are quite frenetic in their energy. Aussies and Goldens have a lot of energy yes, but it generally doesn't have that livewire crazy touch to it.

I still say an Aussie would suit you quite well.

I say an Aussie would be a good fit, a well bred Border Collie (or a lower drive rescue) could work very nicely too!

collie rough
irish setters

Aus Shepherd also came to mind when I was reading through

if i were you ill choose Golden Retriever... i just love golden retrivers...

The only Brittneys I've known were off-the-wall high energy. Moreso than any herding dog I've met. And it never seemed to be the type of energy that is easily directed like a herding dog (although that could have been the trainers).

I've known a lot of nice Aussies that would fit the requirements perfectly.

Golden or Aussie sounds good!

Need you ask ???!!! LOL!!!!

Thanks everybody
Right now I still think I'm going to focus on Aussies, from talking to Zoom in chat and my own research I think they would fit best.

From everything I've read they can be quite independent, protective and dominant. Not something that I think I'm ready for at this point.

I looked at Smooth Collies for a bit (not really a huge fan of all the hair on such a large dog), and they're still a consideration, but I think the aussies fit me better.
As far as the Irish Setter, all the ones I have met were quite...dim, lol. Not the brightest creatures in the world, and with the activities I'm interested in I'd prefer a more intelligent breed.

I still say shelties. They're a really easy to adapt breed.

If you ever want a toy, paps would also fit well. (Okay just had to get that out there, lol!)

Smooth collies are really nice dogs, but you know better than anybody what is best for you.

I don't know if a sight hound would be an option, but maybe a silken windhound or an ibizan? Ibizans are pretty good trackers and super athletes.

I'm going to be completely honest with you, lol.
The mere thought of owning a BC scares me. Probably because all of the BC's I've met have had so much drive and no off switch it was nuts. For example, there is a BC on my flyball team that has a frisbee that is in his mouth constantly, and he focuses in on things (and ANYTHING that is moving he has his eye on) and just bites at the frisbee that is already in his mouth. He's so focused on everything else that he doesn't get anything accomplished during class, last class he didn't even participate because he spent the night with the trainer trying to get him to focus on his handler/his own task instead of everything else. All the BC's I've met have been like this. And I think a dog like those dogs would have me in waaaay over my head.
Another thing that I've noticed is that they seem to be less tolerant of handler mistakes. And they seem to be very sensative, wheras the Aussies I've met seem to brush that kind of stuff off.

Shelties are still high on my list
My trainers have two different 'types' of shelties. Some are the kind you see in the showring, lots of coat and the petite head. And there are some that are taller, have less bone, way less coat, a longer (almost collie like) nose, but definitally wouldn't be seen in a show ring. I really like the latter kind, they seem to have the same temperments, but I like the looks of the taller ones better. I've been meaning to ask my trainer about that...

From what I've read they can be quite protective, which makes me a little weary.

Not really because of the off-leash, exercise issue...

I always say there's two types of shelties- the Nikki kind and the Trey kind, rofl.

Seriously they either look like one or the other, never both.

Like this one looks like Nik: http://www.montanapets.org/rfa/kel01.jpg (back when she was young)

This one is built like Trey: http://cherishpet.com/wp-content/uploads/2007/09/shetland-sheepdog.jpg (if he were groomed)

The larger dogs are probably just oversized pups. they happen a lot even in the best of lines. Shelties were crossed to collies not too long ago so standardization is a big issue. Mine are small, but I know plenty that are closer to 40 lbs. They really should be about 20-25 lbs. Rosie was a big girl- about 30-35 lbs...

One good thing about one Trey's size for agility (he's 18 lbs) is that he's short enough to be in a lower height class than most shelties. Okay, unfair advantage, maybe, but it's still there.

Also coat could be age... Shelties go through a really really horrible stage where they look so scraggly. Nik almost had a smooth coat back then.

Just beware of getting a sheltie from a less than reputable source. Nik's the prime example of how many health problems they can have. Good sheltie breeders do a lot with their dogs. They should also be able to help you find one suiting your needs.

Not all sight hounds are that bad. The whippets I have are pretty good. I mean as good as brittany or BC when it comes to off leash. (herding dogs with drive will run after things that move every bit as much as a sight hound)

I am really enjoying the whippets. Bounce is such a star of her agility class. She is so smart, and focused. No desire to go play with the other dogs when working. They love other dogs, love people, low shed, fairly quiet, smallish, very devoted to their people. Honestly I had no idea how much I would like whippets.

Hmmm... I'm trying to think of some that havn't been mentioned yet, but it's hard!!

Toller? Portuguese Water Dog? Wheaten?

Of what's been suggested already, Aussies sound like a great match!

Toller would be a great dog too. Smallish, very trainable, the lack of doggy odor when wet is a bonus.

Come meet Spanky and Bandit. They aren't obsessive at all... well that's a lie. They have their moments but as far as BCs go they are pretty darn normal. A simple "Enough" gets them to stop their dorky behavior. Compared to my mom's Brittneys that I had when I was wee they seem like lap dogs. Those dogs were like ping pong balls flying all over the place.