Depends a lot on who's out there, but assuming he goes to Houston I wouldn't expect superstar numbers for several years because of Davis' contract. But if you are in this league for the long haul, like 10 years, might as well roll the dice on this guy.
I'd take a proven back over Reggie if there is a decent one available. If you are looking at taking Mewedle Moore or Reggie Bush, go with Bush for the longhaul.