I would imagine that since you have a little one, you will be focusing on MK? If that's true, then yes, the Contemporary is a good bet. You can walk, via a pathway, to MK. It's about an 8 minute walk. Then, if you want to get to Epcot, just hop on the monorail, transfer to the Epcot monorail line and you're there. I loved staying here.
If you want to focus on Epcot/MGM, then the Epcot resorts are a good bet...Boardwalk, Beach Club/Yacht Club. You can either walk to both parks or take a boat.
You could to either the Polynesian or Grand Floridian for that MK access, but the Contemporary is usually a bit less expensive.