For the defense, I'd try to re-do a bunch of veterans deals, such as Canty, Rolle, and Webster. Free agent wise, I'd go for a DT, ranging from a guy like Jason Jones, to a guy like Glenn Dorsey. Henry Melton isn't too shabby either. I'd also pick up a CB, like Sam Shields.
On offense, I'd really just try to address the OL. The skill positions have a lot of talent, aside from TE really. The receivers are stacked, I'd attempt to re-do Nicks' deal. Wilson's future is bright. Eli is a stud. Re-sign Beatty, sign Sebastian Vollmer, and draft an interior guy, preferably a mauler.