It depends on how active you want to be with your dog. If you plan on taking them for long walks, playing with your dog frequently, you should look for an active breed like Lab.
Please dont get pure breed dog and please resuce the one you get.
We got both of our labs, one yellow and one black, from Petfinder.com and rescued them from Arkansas where they have a horrible problem down there having people adopt dogs. We had them flown in from a rescue and our black lab, was in a kill shelter. There are so many dogs there that could use your help as well and they dont have a long time in some of these shelters.
Both of our dogs are awesome and very loving and definitely like long walks! They are also not destructive in any way. I wish you all the best in whatever dog you get. And when you are ready, why not get 2! brother and sister would be nice!