I don't think there's any problem with getting dog that looks good to you.
For example, if x-dog fit my life perfectly I still probably wouldn't get it because I want a dog that looks good to me too... if I didn't like the way that particular dog looked, I wouldn't get it. I know that may sound mean but...
It's like how I love big dogs over small dogs... there are a lot of great small dogs just... they're not for me...
That's how I came to love German Shepherds... I loved the way they look, they were big, not to mention how well-behaved and smart they are from what I've seen before previously getting one.
There were some rough times when as a puppy he was REALLY stubborn but he's beginning to turn into a well-behaved, young dog.
The next dog I get, it will probably be from a shelter though, so there's no wrong in doing that. You save a life and get a great dog.
Good luck with finding the dog for you.