Cavalier's are a wonderfull breed, but you have to be comited to getting one from a reputible breeder, no if's and's of but's unless you want to commit yourless to a load of heartake. Cavaliers are prone to an imense amount of genetic disorders that even good breeding doesn't always prevent. You need to make sure your breeder does heath testing on the heart, eyes, knees, and hips. Their dogs should have passed those test with a good/normal rating or better and the breeder should be more than willing to provied you with the proof of those test.
You need to so lots of research and make sure that cavalier fits you lifestyle. I take it since you didn't even know the correct name for the breed you have some more research to do. Getting a Cavalier isn't something that you can just do overnight, you should expect to be spending about 2-3 years finding a good breeder and being on a waitlist. Cavaliers are also one of the more expensive breeds out there, the average price for pet quality is 1200-2000, anything significantly different then that is a huge red flag and a sign to run away fast.
Here's some links to help you along researching the breed and reputable breeders
CKCSC of USA
-The CKCSC of USA is the oldest breed club for the cavalier in america, it's been around since the 50's. It's not affilitated with the AKC and has much stricter guidelines for their breeders to follow. If you're really serious about geting a cavalier this would be the first place I would look to find a breeder.
American CKCSC
-The American CKCSC is the parent club for the breed associated with the AKC. The club was formed shortly after the breeds acceptance to the AKC when the CKSCSUSA club said it wouldn't be the parent club. The site is a good place for information on the breed and explains the main health problems affecting the breed in an easy to understand way.
CavalierTalk
-This is a great forum to meet Cavalier owners, learn about the breed, and share stories about any future pup that you may have.