I'd love if Dallas somehow worked out a S & T for James. It seems highly unlikely (though Broussard just talked about it on ESPN). However, that would put him in the West (making Kobe's road tougher) and I'm still not sure they'd be good enough to win it all (with Kidd's age and Nowitzki's softness).
I think Dallas would run riot throughout the NBA next season with LeBron. 70+ win team that wins the Title.
Kidd + LeBron + Dirk + Haywood is an incredible core to a team.
The additional quality in depth they have with Shawn Marion, Rodrigue Beaubois and Jason Terry.
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I am assuming the package is Butler + Dampier for LeBron and a role player (Moon? Parker?). Or it could be Butler + Stevenson + Beaubois, or Damp + Stevenson + Beaubois. I'd rather they keep Beaubois because I think he's the best player out of the three of them (Damp, Butler, Beaubois) but either way the Mavs will likely keep at least one of them and have a quality role player there.
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I'd love to see the Mavs sign LeBron too. It would be great to see Kidd + Dirk get to finish out their careers with a legitimate superstar alongside them. Especially a wing who can score and create like a LeBron James (or to a lesser degree Joe Johnson).