Alan Branch and Amobi Okoye will definitely be gone before our pick, so DeMarcus "Tank" Tyler would be my 1st choice as Ferguson's replacement. Has good enough size at 6-2 1/4 306, but can easily add another 5-10 pounds to his frame. He obviously has enough strength (42 reps) to take on double teams and be effective against the run. Would have to spend our 2nd rounder on him though, because he won't be there for our 3rd IMO.
If Tyler does get drafted before our second pick, we should probably wait and draft someone like Joe Cohen, Jeremy Clark, Clifton Ryan or Louis Leonard in the later rounds.