Hey I'm all for giving up Justin Williams if they throw in Ben Gordon or Joakim Noah even though the salaries don't match and that would be hard to pull off.
Noah's attitude problems in Chicago have been severe enough that there's been talk in the press that the Bulls might like to trade him for Hawes, straight across. First suspended by the coach for talking back and showing up late all the time, then suspended another game by unanimous vote of his teammates, then reportedly in a locker room brawl with Wallace and Griffin. For a rookie, he sounds pretty big for his britches, and he clearly does not take playing for a losing team very well. Considering what things are like in Sac right now, I'm not sure that we'd want him, but his price seems to be quite low at the moment.