I might be best to look at the team in terms of needs and figure out who are locks.
Wing Scorers -- You assume LeBron, Wade, Kobe (he's on until we know he's not), and Durant
Big Men -- Interior defense was the biggest weakness of the World Championship team, so Howard is a lock.
Ball Handlers -- I think Paul and Deron Williams are both locks, but maybe we just assume one as a lock. Until Paul comes back, I assume Williams.
That gives us 6 more slots. Two have to be big men. Two have to be ball handlers. They could use some defender/glue guys who won't need the ball to contribute.
I like Rose as a ball handler/defender/glue guy. So the question is whether to go with the second all around PG in Paul or a penetrating scorer like Westbrook. I pick Paul.
Bosh gives a low post scoring option, and his range makes him a versatile NBA big guy, so he makes it. I think the next big has to be a shot blocker. That's one position that's too far away for my liking. If it's not Chandler, however, I think it would be a Chandler type.
Which leaves us with the 11th and 12th guy. I do think an Iguadala is a better choice in the context of this team than Carmelo. He can defend, shoot some threes, and get ugly hoops.
For the 12th guy, I think you could make a case for either a shooter or another big guy. I think Kevin Love has a great game for international play, because he's a physical rebounder with a nice outside touch. Wade and Kobe shoot well enough that I'd be comfortable eschewing the shooter.
So, my team would be something like.
Williams, Paul, Rose
Wade, Kobe, Iguadala
LeBron, Durant
Bosh, Love
Howard, Chandler