The argument for avoiding some positions early in the first round of the draft is made really well here. You can get a good RB in FA just about every year. Need to get lucky to get a good OT in FA.
Think this is a good illustration of the positions where you can likely find quality players in free agency. Will be plenty of young talent available at RB, LB, and DB. Pickings are slim at QB, WR, and especially OT.