Why don't you just look around at the local shelters and maybe the perfect dog will find you?
It's really hard to specify what breed you should get. All dogs are different in their own way even within the same breed. For example, Aussies. You might find a hyper one (like mine) and then you might come across a mellow one. There's no telling.
I know at the shelter where I volunteer, the adoption counselors sit down with you and go over what it is you are looking for in size, temperment and everything. Then they look through the list of adoptable dogs to see if there is a good match for you.