Peters because of the position he plays and his ability. Shaq has potential, but he's a 4-3 OLB or an ILB in the 3-4. Very few LB's who are not pass rushers get picked in the first round. Shaq is really good with the potential to be great, but he's been overhyped because of his high school ranking.
The dark horse is Kikaha. The two ACL tears will probably work against him, but playing Buck (OLB/DE) in the 3-4 should help his stock. If he can play a little OLB at 260, it will greatly help his stock. It always helps to be versatile. It's going to be tough to ignore him if he gets 15+ sacks, which he can playing this schedule.