Touch choice here because I think the obvious candidate -- Leon Brown, who will win a starting job somewhere on the OL and likely play well -- is a bit of a misleading choice given that he is a JUCO player who was already coming along even towards the end of last year. I have a hard time calling it a real "surprise" if he takes off and has a strong season, and in fact I kind of expect that he will do just that.
As for the rest, I guess you have to go with either Sims (first real opportunity) or Fowler (talented kid another year removed from ACL surgery). I feel like while Vogler, Ivory, and Perry have been decent players in the past, they've also had a lot of chances and have largely who they are at this point, and I wouldn't really expect a break-out year from any of them. By the same token, we've really gotten nothing out of Dickson since he stepped on campus, and even at this juncture Orr would have to make a significant move up the depth chart to even get meaningful snaps.