To get to 16 I'd say WVU and Okie St. In the long run, the AAU schools available in the B12 probably aren't worth the hassle of integrating into the SEC. Yes, desperation can make for strange bedfellows, i.e. Mizzou, but the Tigers are IMO at the outer limit of NW expansion for the SEC.

As 10th mentioned, there will be significant opposition from several SEC West schools regarding any further TX/OK additions. My selections of the Cowboys is meant to be a non-threatening alternative that might actually be accepted.

While Cincy isn't even in my top 5 expansion choice, if they were invited, the Bearcats could use Paul Brown Stadium (~66K) until they found a proper replacement for Nippert.