If there is any possible way to trade up for Derrick Johnson that is definately the way to go. I've watched every college game he's played in and I guarantee he will be the biggest impact player in this draft. That said - I believe he will go in the first three picks, so I doubt we have a shot at him.
From the same team - I would love to see us pick up Bo Scaife in a late round. We should be able to get him in round 6 or 7 and I know it's risky but it could pay off big. If not for his knee injuries he would be going much higher. Assuming he stays healthy he should be a fairly productive receiver in the NFL.