I'd say he may be ready around mid-season 2008, but few players are actually brought up when ready. With the way most prospects work, I'd say a Sept. 2008 call-up and then 2009.
I figure he'll start in A+ next year and play there for a while, and, depending on his successes, he could get moved up to AA. He'll more than likely spend most of, if not all of 2008 in AAA.
OF (x3): CarGo, M. Bourn, D. Jennings
UTIL (x2): E. Encarnacion, C. Hart
BN: Cuddyer, C. Ross, J. Montero
SP: Price, Gallardo, T. Hudson, Lester
RP: Chapman, Jansen, Rodney, Putz, Cishek, Bailey