Are we cutting Ware?
If so, DE is a need pick at that point. We'd have to focus on a guy like Trent Murphy or even trade up so we're in the mix for Clowney / Barr / Mack. Almost impossible to find a DE past round 1 that can hold his own immediately. I really like Michael Sam at Missouri or Marcus Smith at Louisville and a couple others in rounds 2-3, but they'd be situational rush men early. I don't agree that DE has good draft depth this year...or really any year.
With DTs, you can sub around weaknesses and find contributors throughout the draft. It also seems more possible that you'll find someone who takes to NFL level training and you hit a home run.
So much of the DT position is about leverage, hand technique, and effort. At DE, if they can't turn the corner like a speed skater, they're no better than a 4-7 sack-a-year guy if you're lucky. Better hope they can play the run.