The likely candidates IMO, in no particular order:
1. Beason. Should be an excellent cover 2 LB. I don't have faith that Harris can stay healthy, plus DE is at the downside of his career. Would probably be a rotational player until Nap gets hurt, DE is moved to the middle and Beason gets the start on the outside.
2. Blalock. 4 year starter. Should be a pro bowl guard. Played RT (which suddenly becomes a position of need) for 2 years and never gave up a sack. No character issues and is extremely smart. Everything you want in a player, except for the fact he is most likely a guard with the possibility of RT.
3. Reggie Nelson. Superb athlete that brings it on Sunday. Lots of reports he will slip to KC. Arguably not a position of need, but IMO it is tough to pass on a player that could be the next Reed.
4. Charles Johsnon, DE. I know 99.9% of people will disagree with me valuing him this high. I just think he is this year's Tamba Hali. Good effort, hard worker, etc. NFL.COM link
http://www.nfl.com/draft/profiles/2007/johnson_charles