As far as DT goes, we may be relatively okay. Triplett is steady, and probably would be better with a more dominating guy next to him. McCargo, IIRC, plays the same spot and with those two we would have a pretty solid position there.
The other DT spot is manned by Williams and Anderson. Williams is still raw, and may prove to be a good player, but right now he should be the backup in a rotation at that position. The problem, as I see it, is Anderson. We really need someone who can dominate at that spot, and if we can find someone to take Anderson's spot, I'd be happy with the Triplett-McCargo-Williams-[Other Guy] rotation. If the other guy is a true disrupter, we would then be in great shape.
So all I'd be looking for this offseason, actually, is a guy to stick in front of Williams in the depth chart.