I'm already tired of this. Mark Berman talked to Lance Berkman (no relation) who said that a number of teams were checking in on Berkman. Among the teams not named "Astros:" Rays, Red Sox, and Phillies.
If Berkman is interested in staying close to home, then the Astros are obviously in the lead. If he's interested in winning, then obviously any of the other three teams are going to be better bets for Berkman (how's that for alliteration). If it turns into a bidding war, I'd expect the Astros to be out, but who the hell knows?