Fire away. Seriously. I'd like to hear your top 5--under these conditions.
I looked it over. There aren't a lot of UFAs who would help, and none better than Marion. I stand corrected there. So it would have be a RFA.
Let's assume, just to streamline things, that we're talking about the deal where Minnesota and Blount go to the Knicks for Houston, Frye, Lee, and picks. That puts them in the summer of 2007 with a core of Frye, Davis, Lee, Jaric, McCants, and I guess Griffin. They may not quite have room for a maximum free agent in that scenario, but if necessary, let's say they also figure out a way to pawn off Hudson or even Madsen.
So here are the big RFAs in summer 2007, with my assessment of how likely it is that they might change teams:
Chris Bosh -- the big question mark, can't count on him staying
LeBron James -- pretty unlikely, but not unthinkable
Carmelo Anthony -- would require a big personality clash in Denver for him to leave, very unlikely
Dwyane Wade -- no chance
Josh Howard -- poised on the verge of stardom, could be another Joe Johnson type, has potential to surpass Marion in my opinion but stuck behind too many stars in Dallas
David West -- nowhere near Marion's level yet, but by summer after next, who knows?
Chris Kaman -- has made huge strides this year; if he gets much better, look out
Overall, I'd have to say that you're right, and Marion/Bell looks like a deal that's at least comparable to what they might get from another team. But it's all pretty unclear.