I knew there was an interactive site that would suggest a type of dog and I finally found it. Try this:
http://www.ivillage.com/pets/tools/breedselector/

It will walk you through size, commitment, compatibility, health, and protection. It will then suggest different types of dogs that may best suit you. It will also give links to more in depty information on each of the dogs it suggests.

Hope this will help.