Nah, you can't do much with the Bobcats and Cavs, they don't have that much trade assets.
Wolves - The team can live without D-Will. Anthony Randolph, Kevin Love, B-Easy and Ricky Rubio have a high trade value so you can easily get a superstar to join them.
Pistons - There are lots of trade baits here, Prince, Gordon, Hamilton, Stuckey, Wallace etc.
Kings - Only thing missing is Jimmer, I think. You have Thornton, Evans, Cousins, Thompson, Hickson. In 3 years they could be contenders in 2K12, even without Jimmer.