Old guys gotta go, rebuilding. I'll place available players in value tiers, from lowest to highest.
For Draft Pick
Antrel Rolle
90th-105th pick
For Young Player and/or Draft Pick
Cullen Jenkins
Talented young 3-4 rush OLB/MLB/DT w/ 80th-130th pick depending on young players talent
Or
65th-85th pick
All of these are just starting points, of course. Quickly thrown together for an idea of where to start.