If we're renting DVC points, I'd say AK Lodge. The place is unbelievably immersive, the rooms are well-appointed, lots to do on-property, ZEBRA DOMES, and you can frequently rent points for around the same price you'd pay at a moderate. Also worth mentioning is renting at Old Key West. Again, great pricing, HUGE rooms, conveniently located on the Sassagoula River (I love traveling to DTD on the boat), and a beachy, laid-back atmosphere. We love the pool-front bar at sunset.
If we're booking a room through Disney, I'd say the Port Orleans resorts. We prefer Riverside, but I know many who love French Quarter. Good price point (particularly if you can snag a sale rate), good food courts (when we're NOT staying at Riverside we intentionally visit to get beignets!), located on the Sassagoula, and a relaxed, charming atmosphere. We love walking the trail between Riverside and French Quarter in the early morning.
EDIT: We've yet to do Coronado Springs, but from what I've heard and seen, it's a great contender for "most bang for your buck." We've been trying to stay here for a while, but it always seems to be sold out!