Big 12, Big Ten, Mountain West, AAC are all options.
If the Big 12 doesn't get anyone out west and can keep Oklahoma and Texas they should grab Cincy and Memphis for WVU travel partnerships.
Then you can have two new Pacific Conferences.
Southwest: Utah, Arizona State, USC, Arizona, UCLA, Utah State, San Diego State, BYU, Colorado, Colorado State, Nevada, UNLV
Northwest: Washington, Washington State, Stanford, Oregon, California, Oregon State, Boise State, Fresno State, Wyoming, Air Force, San Jose State, Hawai'i
This would lead to a new AAC that has UCF, USF, Tulane, ECU, Navy, Tulsa, Buffalo, Temple, UConn, Houston, SMU, New Mexico, UMass, and Liberty. Conference USA would add Marshall to replace Buffalo and Conference USA would add New Mexico State.