We are a family of 5, and stayed at POR, Poly, and the cabins.
A lot would depend on how much time you will be spending in the room (not just at the resort, but actually in the room). If you are going to be using the room for sleeping and not much else, I would book POR. For our dates:
POR - $229/night
ASM suite - $307/night
AoA suite - $390/night
Cabins - $327/night
GF - $605/night
Poly - $474/night
If you are going to be spending lots of time in the rooms, I would go with ASM. I don't think AoA is worth over $80/night more. Poly and GF don't give you that much more room than POR, at least not enough to make a difference if spending lots of time in the room.
If you are planning to spend a lot of time in the resorts, but not necessarily in the room, then GF and Poly make more sense. While monorail or boat to MK is very nice (and, in the case of Poly, walk to TTC for monorail to Epcot), that alone is not worth the price jump, in my mind.
Cabins gives you more room than the suites, but only 1 bathroom. If you will have your own car, I would choose cabin instead of ASM suite. You have your own parking spot by your cabin, and it's great driving to the parks (except MK). For MK, bus or walk to the boat launch (depending on how far you are). When we stayed at the cabins, we lucked out and were in loop 100, right near the MK launch. Didn't request it, it was pure
We had a car, so we took our car from our front porch to the parks, except MK which was a short walk to the boat launch.
If you are using Disney transport, and you are in a cabin far from the main bus stop, then it would be 2 busses to every park. Hence, I would pick ASM suite over this.