If thats the case, I'd go with the player at the position that could help you most now or soon.
Flores is far away and blocked so he's...out
Dominguez has surprised everyone, not me though, but he's climbing quickly, Sept '10 callup at earliest...out
Revere is pretty polished but the Twins have better/similar players already...out
Poreda should be very close you said, I think he sticks as a starter...in
Cardenas is the best 2B prospect in baseball but blocked by Ellis and rivaled by Weeks and Patterson...out
Lawrie moved to 2B from C, might be next Biggio with more power less speed but far away...out
Main is very much over shadowed by Feliz and Holland...out
Oliver and all college players have yet to sign so you never know but he's got the fastball you want and ahead of the other college players...maybe
So, i think Poreda is the pick unless you wanna gamble on Oliver though Dominguez is getting Zimmerman/Rolen comparisons.