I like what you have but I would change it just a bit (this is in no particular order):
1st Tier: KU
2nd Tier: Baylor, KSU, OU, OSU, ISU
3rd Tier: TU, WVU
4th Tier: TTU, TCU
Also, You forgot to put Texas in there... Was that on purpose? Or just an oversight? I am interested as to where you would place them...