There seems to be a bit of a clog when it comes to corner outfielder/first base types that have a decent shot of making the pros.
Keys, Tirotta, Micheletti, Pinango, Cunningham, Williams, Shreck all fit that to some degree or another and i'm probably missing some.
Age wise Keys if he keeps this up at all, and makes the jump to triple A this year.. he might be the highest upside but i wouldn't be surprised if a lot of that list gets cups of coffee somewhere.