Of the schools listed, I think Rutgers is the most likely choice. They would add TV set all across the east.
Not calling you out in particular as many have said this, but it is not true. The State University of New Jersey would primarily draw from 2 MSAs. Both of them are top 5 TV markets in the country. However, the Philly market is already a Big10 market, and NYC although it has many eyeballs isn't a college sports market at all. And Using ABC's regional coverage map to assign markets to conferences, NYC more often than not is already a Big 10 market.
So with $ being the ultimate driver beyond the obvious selection of Notre Dame which schools would bring $. $ is defined as household viewers of Football and Men's Basketball. Missouri make sense as it delivers 2 primary markets in KC (some what still split with Big XII and KU/KSU) and St. Louis, as well as, deliver the entire state's secondary markets.
Pitt adds little as all of PA is mostly PSU, eastern OH is OSU. One school that I haven't seen mentioned that I think makes a lot of sense is UCONN. From the Big 10 perspective it delivers the NE. As an emerging football program, do they take away the ties and prestige of a basketball school and it's allegiance to the Big East?