The Call to the Pen blog took themselves a look at Astros prospect (2010 4th Round draft pick) Bobby Doran:
With his size and already above-average fastball command, he’s got a chance to be a back of the rotation innings eater. With some mechanical tweaks and instruction he should be able to add a bit more velocity to his fastball which was topping out at about 94 prior to the draft. If he can add that velocity and maintain the natural movement of the pitch he could turn into a viable #3 starter. He doesn’t miss a lot of bats currently, but his curve and changeup are both legitimate offerings that would be augmented with an improved fastball. Doran strikes me as the type of guy who could take a big step forward in 2011.
In my book he’s a #3 at best (and that is optimistic) and a middle reliever at worst, but either way I think he makes it to the major leagues with the Astros if he stays healthy.