In the "Offsite Hotels" thread holder, there are many debates and threads. While I haven't stayed there, I've heard good things about the Marriott and Signia by Hilton Bonnet Creek. I know someone who uses points to stay at the Waldorf and really enjoys it. Other posts talked up Grande Lakes but, again, I don't have any personal knowledge of any. I've been thinking about staying at the Sheraton Vistana - Lake Buena Vista as those are good sized rooms and still close to Disney. One person responded to my question that it was a great place to stay and that was fairly recent.
Not helping you too much but I would check out that section. Also, Allears.net has reviews for some of the offsite hotels.