I'm a defensive first guy so I'll take the D. Also, I think in terms of this draft, the talent is stacked on the defensive side of the ball. For example, Daniel Jeremiah has 12 defensive tackles on his top 50 list. Of those, 6-7 are first round worthy players.
Obviously, the offensive line needs upgrades. But I'm starting to think the offensive tackle signed from Chicago (forgot his name) will be the stopgap option at left guard with youngsters battling it out for the right guard spot. Guard is huge in a division that is stacked with quality defensive lineman.
This is the year to get rich on the defensive side, though, at least in my opinion.