Big 12 . . . Immediately invite ASU, Arizona, Colorado, Oregon, Washington.
Seriously you want to nab them quick. Destabilize the Pac before they start hunting for you. While Stanford may be a long shot, you want to bolster the Big12 with similar level schools and make sure we are not attacked by the Pac12. Raid the Pac 12 before they try to raid you. Oregon and Washington may join when they see the writing on the wall.