The two contenders have got to be Chicago and New York, right?
New York Knicks
Incoming: Amare Stoudemire, Raymond Felton, Anthony Randolph, Kelenna Azubuike, Timofey Mozgov, Ronny Turiaf
Outgoing: David Lee, Al Harrington, Chris Duhon, Sergio Rodriguez
Chicago Bulls
Incoming: Carlos Boozer, Ronnie Brewer, Kyle Korver, Kurt Thomas, C.J. Watson, Omer Asik
Outgoing: Kurt Hinrich, Brad Miller, Hakim Warrick
I go back and forth on which team improved more, but for now, I'm going with the Bulls. They filled the holes they needed to fill, without taking on any question marks.