I think it's going to be New jersey for a number of reasons:
1.) They have the space to not only fit him in at max but also, depending on the salary cap amount to be decided, pretty close to enough for another max contract of maybe just slightly less than a max. Can anyone say Joe Johnson or Chris Bosh.
2.) Jay Z is a very good friend of Lebron's and is a minority owner of the Nets.
3.) With possible new ownership coming in Russian billionaire, Mikhail Prokhorov, and the avenues being reopened for a new arena to be built in Brooklyn and the team moving to Brooklyn, this would open up a huge marketing opportunity worldwide selling a brand new brand of NBA basketball, Brooklyn Nets black and white apparel.
4.) The Nets already have a very promising nucleus of Devin Harris, Brook Lopez, Courtney Lee, Chris Douglas-Roberts, Yi Jianlian and Terrence Williams. Harris(47), Douglas Roberts(31), Jianlian(29) and Lopez(31) are all players that have once scored 29 or more points in an NBA game. Lopez has ripped down 20 rebounds in an NBA game. And all these guys are young and can grow with Lebron.
5.) The Nets still own their 2010 draft pick and will probably be picking somewhere in the top 7 where players the caliber of John Wall, Cole Aldrich, Devin Favors, Willie Warren, Ed Davis and Evan Turner.