We've stayed at CBR, Contemporary, Poly, WL, BWI and GF.
Of those, my favorite is definitely BWI. I love the size & look of the rooms, the atmosphere on the Boardwalk, the ease of walking/boating to Epcot & DHS, the extremely friendly CMs, and all the dining & shopping options in the area.
My husband's favorite is WL (and it's probably my second favorite). The theming is incredible, the resort is compact & easy to get around, lots to do & see, easy access to all the goings-on at Ft. Wilderness, and the boat ride to MK. The negative for me on WL is the size & relative darkness of the rooms (and they definitely could use updating...but that's apparently starting in April). Still, it's a great resort & we'll be staying there again in November.
Either one would be cheaper than Poly. The BWI perhaps only a bit cheaper, WL a decent amount.