Tough call - the DInc2 is a nice phone but not getting a lot of Dev Love (Thought it has CM7), The Bolt has issues as far as battery and finish but It does have a bunch of ROM's. The charge is the newest and the one I know the least about. I guess if you can get over the PhilWiz interface the Charge is good choice, or the DInc2.
The Incredible 2 is the least expensive of the 3. I need to go see it to check the condition. The seller says it has some small screen scratches from a nail file in his wives purse. After I look at it, I might go that way if It's not bad.
I would hold out for the rezound/vigor if at all possible. I've read where Joelz and Nils are both considering moving on to the rezound if and when it ever decides to appear. So there's two really awesome ROM chefs already in your corner!
Plus its really the only phone I've seen (not physically but spec wise) in almost two years to make me really think about putting my beloved Inc in a drawer, permanent!
Cool. I can upgrade in August '12 so I might go Rezound then. For right now, I just want something a bit larger and the Incredible 2 might be the ticket.