I went in 2009 and 2010 and both times stayed in Haines City. Its cheaper than all the other places like Kissimme and Int. Drive but its only 15 minutes away from Disney and the other attractions so for me it was a no brainer. We stayed on Calabay Parc, Tower Lake.
http://www.destinationtowerlake.com/4beds.htm
http://www.destinationtowerlake.com/4beds.htm