ole miss has got to be up there. they are simply a slower, less explosive team on natural grass. their game is built for speed and their home turf plays in their favor. always has, but the flip side is they lose the games played on natural grass more often than not when playing decent competition. they played 3 games on natural grass last year....vandy at LP field (incompetent pushover), aTm (a very mediocre team), and lsu (slightly above mediocre). Secondary to the obvious benefit of playing in front of your home crowd and sleeping in your own bed etc, the turf has been a huge factor in the egg bowl in my opinion. over they years, they simply dont play to the same level on natural grass and that isnt going to change any time soon. they have really struggled on natural grass over the last decade, and i recall they had quite a long losing streak on natural grass going back a few seasons.
edit to add: not that om is going to be as easy as some of us appear to think, however, given the above, i think it is in our favor.
next tier, i would say @ mizzou and @ aTm and LSU. johnny football isnt walking through that door anytime soon and mizzou just seems like a team we match up well with, but people have underestimated them before to their peril. LSU for the reasons already mentioned.