I think it'll be wide open.
4 teams from the West lose their QB (McElroy, Masoli, Newton, and Mallett), and at least 3 of those were big parts of their team's offense.
Playmakers like Mark Ingram, Julio Jones, Terrance Tolliver, and DJ Williams are gone.
Alabama, LSU, and MSU all lose their left tackles. You also lose your center, and I'd say those are the two most important OL positions. Auburn loses their left tackle and 3 other OL starters. Arkansas loses 3 OL starters, including both tackles.
Auburn loses probably 7 defensive starters, including the biggest (Fairley). Arkansas loses a handful of key players on defense. You obviously lose McPhee, White, and Wright on defense. We lose our entire DT rotation and about 4 starters in our back 7 as well.
Bama does return most of their defense. LSU returns a whole bunch on offense and a lot on defense, but they lose Nevis, Sheppard, and Peterson, all big keys on their D this year.
I'd say Bama and LSU have to be the early favorites in the West. LSU's key losses will be on defense, while Bama's will be on offense. Arkansas won't be far behind them, though they have to figure something better out on defense, and I still think their offense will miss Mallett more than they think. Wilson is a solid QB, but he can't stretch the defense like Mallett.
I think Auburn will have a hard time finishing in the Top 25 next year. 7-5 may be realistic for them, at best. You should have another solid year, but I don't think you're ready to crack that top 3. I have no faith in us right now primarily because of the defense. If we don't do something about our defense, it doesn't matter how good our offense is next year, it won't be good enough.