All dogs are individuals, even within given breeds, but a breed's original purpose and inherent traits can help you determine whether you and the dog might be suitable for one another.
Recommendation: Research the breeds or types you are interested in on as many sites as you can; each description will be a little bit different, depending on the author's perspective. Once you have done your on-line homework, if you are considering getting a dog of a certain breed, talk to people who have one, talk to breeders, veterinarians and trainers and put together a full picture of the breed and its potential suitability for you and your family.
The Most Popular Dog Breeds, in alphabetical order, according to Dog Breed Info:
Great Dog Breed Info Links
Great video info on the top 100 dog breeds.
This is an excellent resource site for dog breed info and lots more, no matter where on the globe you live!
Descriptions written by someone in the Pack Leader training modality, but lots of information provided.