If they stand pat again this year and lose Danny Ferry should be fired after making the same mistake last year. BostonGuy is right they don't have a #2 scoring option. Jamison is better in the sense that he is a more crafty veteran scorer who has always been the 1 Wizards player to show up to the playoffs the last few years, Iggy is better because he'd take defensive pressure off Lebron and would let Lebron move down to 2-guard (his natural position IMO), basically he could be a poor man's Pippen with his defense and point-forward skills. He is also younger so Cleveland could build around him and Lebron should Lebron stay there.
I'll say this for the 1000th time, Mo Williams is relied on too much. His ideal role is a combo guard who can come off the bench and give the 2nd unit some fire power, basically a Jamal Crawford type role. Look at what moving Jamal Crawford to the bench has done for his career, he was known as a one dimensional chucker but this year almost made the all star team.