I think you SHOULD definitely consider the parks you will spend the most amount of time at when picking a DELUXE resort. After all, one of the major benefits of them is that they are located within close proximity to one or more parks...
That said, you mention you like MK and AK the most. AK is an odd park, in that it is far removed from EVERYTHING else. Even staying at AKL would mean a BUS to AK, so the close proximity to that park nets you nothing when staying at AKL. You will be THAT much further from the rest of the attractions at WDW. That, plus the SLIDE at AKL is pretty lame...it's more for the 8 and under crowd.
I think you should concentrate on one of the MK resorts. Poly seems like it would be just perfect for your family. WL too, although it suffers from the same "lame slide" problem as AKL.

BUT, it really takes that "outdoors" theme to new heights, and it's my favorite all time WDW resort, just because the theme is pulled off SO well that it feels like a "vacation within a vacation" every time you get back to your resort. It's SO peaceful. And, there is so much recreation there...
Forget the suggestions of the Epcot resorts. Yes, Stormalong Bay is great, but it gets crazy crowded, and the rest of the resort doesn't seem to mesh with your needs/likes at all. The bus system at these resorts is convoluted and time consuming to go anywhere.
I'd choose either Poly or WL for you (WL if you're looking to save a few bucks), and add in the water parks fun and more option, for your DH and son to enjoy the REAL waterslides for a few days.
