You guys have already picked the cherries.
I would like to see Barwin starting, based on merit and not injuries. I know he will be used primarily in passing situations to begin with, but with his physical tools, he will eventually be a good run stopper, too. Hopefully, he'll be a quick study. If he earns the start to kick Smith inside, it could be a very rugged d-line. If Okam could also earn a starter's spot, then that is even better.
The d-line should be significantly better this year, even if Barwin and/or Okam don't start. Smith is a huge upgrade to Weaver, and Barwin will be a better pass rusher than anyone not named Williams and possibly Smith. Deljuan is good enough to start, so the entire rotation will be better than last year.