HTC G2

I garentee you that someone over at xda will have this thing fully rootable soon. I know they had the same issue with the droid x's bootloader, but they got that issue resolved With how many devs are gonna have this phone its only a matter of time.
I wouldn't recomended the vibrant if you like a keyboard....with this being a stock android/dev phone it'll also get the ota updates the quickest. To be honest i love my vibrant but i hate keyboards. Stock android in my opinion is better...and to be honest its super annoying waiting for how slow samsung is taking just to push out bug fixes for the gps and lag issues.....i know its gonna really piss me off when it takes forever to get froyo and gingerbread.