Look at the pro's and con's of Lebron going to each of the teams he's interested in
Miami
Pro's: Creates a triumvirate which rivals Rush in the greatest of all time discussion. Definite favorite to win next year. Trading Beasley could even acquire a decent PG/SG (Wade could be the Point). Coaching (Pat Riley).
Con's: Creates the stigma of he couldn't/didn't when one without Dwayne Wade. Not a superb world market like LA, NYC, Chicago.
Cleveland
Pro's: Lebron's home. Can offer the 6th year. Some supporting cast.
Con's: Cleveland is ****. Team is very unlikely to win a championship in the near future. No Cap-Room.
Chicago:
Pro's: Derrek Rose. World Market. Good supporting cast. More cap-room/options to pick up a Boozer/Lee.
Con's: Might be a few years for Rose to develop into a championship caliber team floor-general. Not instantly a contender (but close). Living up to MJ stigma.
NYK
Pro's: Number 1 market in the world (instant world-star), opportunities beyond basketball, D'Antoni's team inflates stats, Amar'e. Team would probably win a lot of games. More cap space (but not enought to pick up a max). Could acquire Carmello in a year.
Con's: A contender-- but probably not organized enough to beat teams which have dismantled D'Antoni before. No point guard.
NJ
Pro's: Proximity to number 1 market in the world. Prokhorov. Decent supporting players (Harris, Lopez, Lee, Favors). Cap room. Can build a team beyond 2010
Con's: Not enough talent to contend.