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San Diego State
The predicted breakup of the Big 12 might be the impetus of the college football shakeup but, once the dust settles, it will still exist as a conference due to the simple fact that the Big 12 is an automatic qualifier. Even if, as I predict, everyone cuts and runs, leaving Baylor and Iowa State manning the fort, the Big 12 still exists and still has a BCS bid.
The Mountain West teams are hungry for automatic qualifier status, and any who receive an invite will jump at the chance to join the Big 12, which will make a quick move to expand to 16 and cement its membership. Boise State, BYU and TCU give the conference some legitimacy, and membership is filled out with the "best" of the Mountain West and Conference USA. Hawaii is certainly a stronger team than several of the above, but I'm predicting travel costs and the potential for better regional rivalries will lead the Big 16 to look elsewhere.
Also, it's entirely possible that the Kansas teams will stay put, in which case the Big 10 snags two eastern teams and the service academies join the coastal conference in whatever form it takes.