So for Dallas to get enough cap space in 2012 to sign a max contract free agent, while keeping Tyson Chandler, they would likely have to:
(1) Not resign Jason Terry, Caron Butler or JJ Barea
(2) Amnesty Brendan Haywood next summer
(3) Use the stretch exception on Shawn Marion next summer
(4) Trade Rodrigue Beaubois, Corey Brewer and Dominique Jones while taking back no contracts that last beyond this season.
That would leave them with Dirk Nowitzki ($20.9mil), Tyson Chandler (say $12mil), the ghost of Shawn Marion's contract ($3.5mil) and 10 cap holds for empty roster spots at $500k apiece.
That would give them a team with Chris Paul or Deron Williams, Dirk Nowitzki and Tyson Chandler ... or ... Dwight Howard, Dirk Nowitzki and a solid perimeter player that they trade Tyson Chandler for (say Gerald Wallace). And then that $2.5mil exception and minimum contracts to round out the team.
That is a lot of talent to part ways with for only a decent shot at landing a top name.