It got ridiculous awhile ago, but assuming the attraction toward 20 Stanford, Oregon, Washington, and ND make for the strongest overall group in my estimation. You pull in the Bay area market as well as the other obvious markets. Stanford and Oregon have pretty broad based athletic success. I'm not up on every non revenue sport, but those schools are strong Tack and Field schools, which complements a lot of other things going on in the Big Ten already. And you would be responsbile as a conference for a ridiculous fraction of the country's PhDs.