I know it will never happen because their franchise is cursed, and horribly managed, but talent-wise alone, if you are LeBron, you can't beat joining the Clippers:
PG: Baron Davis
SG: Eric Gordon
SF: LeBron
PF: Blake Griffen
C: Chris Kaman
Key Reserve: DeAndre Jordan (and plenty of guys who want a ring and will sign for cheap).
Also, imagine the hysteria in the media and in LA about LeBron vs. Kobe ... who owns Staples.
Another great location for LeBron would be to join Wade in Miami (but not sure their egos could share the spotlight). If he joins the Nets or Knicks, their situations will be similar to Cleveland, at best, over at least the next 2 years.