If we're going to put a premium on a player because he is close to contributing, I'd prefer to do it on a 3B or OF, which would seem to be the biggest organizational needs for the next few years- which is one of the main reasons I'd be happy with Richie Shaffer (and Victor Roache in the sandwich round).
It's not that Wacha is close to contributing, it's that he's a good pitcher. Keep in mind, too, that someone -- I think Goldstein from BP -- recently said it could be the worst group of college position players in the last 20 years. If you give that any credence, I don't know why you'd want Shaffer or Roache over Wacha. Reds already have some solid 3B prospects in their early 20s (HRod, Vidal), and guys like Lamarre, Billy H and Lutz are candidates to play OF in Cincy within a couple years.
It's a mistake to discount pitching on the basis of what the system looks like at any one time, IMO.