I'm glad to see a number of people voting for CBR...I just booked our stay a day or two ago for October. We usually stay Deluxe, but we're not going to be there very long and we were looking for a less expensive option anyhow. I love the Poly (duh,) and I really liked the beachiness of CBR last time we stayed. I also like its closeness to Epcot and MGM, too.
Though really, I don't think it's possible to go wrong at WDW...the one and only time we ever had a problem was when we stayed at the Villas at the Disney Institute (blast from the past,) right before they closed...you could tell the staff was getting lax and my dad very kindly said to the guy at checkout, "Now, we've stayed at WDW many times...and this? Is not Disney quality." (We had had no hot water for like over a day, the room hadn't been cleaned, we weren't being petty here!) The guy said, "I know, you're right!" At least they were kind enough to give us some discounts (I think we got a night or two free or something.)