Biggest move the team needs to make is replacing DeMarcus Ware. Greg Hardy is a great option for that.
We also have to replace Hatcher/Ratliff. I believe Henry Melton would be the obvious choice, depending on his health and status.
Those are two high priced free agents, but they'll help remake this team overnight.
In the draft if we add Stephon Tuitt or Trent Murphy I think we'll be sitting pretty. Hopefully we could draft a defensive tackle in the 2nd or 3rd round, if not Bass would get the nod.
Releasing Ware and Austin, having already released Ratliff, and not resigning Spencer, affords us the ability to spend more on the defensive line altogether.
Thoughts are welcome, even dissenting ones. I think the biggest worry would be how healthy Melton is, and if he can come back and produce as he did before. If we keep Marinelli, I think this is a no brainer. Without knowing much behind the scenes, I'd guess that he'd want to come back to Texas where he is from and play for the his old defensive coordinator. He might be on the outs in Chicago because of his legal trouble combined with his injury and expense.