The need for an OT is best addressed with teh later pick in the 1st rd not the #4 pick, we have our cornerstone LT so it is a RT we need and you do not pick RT's @ #4.
CB and LB are needs but the biggest problem the team had was @ WR this year. Defenses did not respect the WR play at all.
I agree trading down would be good at this point in time but I do not want to trade down too far. If we can move down just 3 or 4 spots and pick up an additional 2nd or 3rd rd pick it would be very good.
Right now I al looking at Blackmon and Jeffrey @ WR, Claiborne and Kirkpatrick @ CB, and Brown @ LB
If we can somehow end up with at least 2 of those players I would be very happy.
As far as FA goes as strange as this sounds I would like to see the team resign Hillis just to provide a bit of stability at RB.