I see why you are having a hard time! The GF, Boardwalk and Contemporary are all great resorts!!!
This would be tough for me too but if money wasn't an issue, it would be GF hands down! For the atmosphere, the new pool and location! And if you are lucky, the MK/lagoon view!
My second choice would be the Contemporary because of it's location...you can walk to MK, take the monorail to MK and Epcot. The room views are amazing! The monorail going through it. Great fun.
Last but certainly NOT least is the Boardwalk. Great location for Epcot and MGM. Beautiful resort kind of similar to the GF in atmosphere. Cute pool. The Boardwalk has great entertainment at night.
Good luck choosing!