Frankly, with Weeks, he doesn't need to show much more power than he already has, with his OBP-speed combo. As long as he doesn't actively regress he'll be quite a serviceable 2B. The power upside is pure bonus. You do want a decent utility man behind him however (a Maicer Izturis type should cover it) for the days when he won't be healthy.
As for another 2B who's left, I'd have to search a bit but the only guy I can think of who's still on the board and worth much at all is Alberto Callaspo. Who I was going to take if Weeks didn't fall to me. Maybe Jose Lopez too but his OBP is putrid as a rule