I see two viable options that fit in with the Big Ten's mold in three categories: Academic Excellence, Athletic Tradition, and Geographical location. With these in mind, I think Pitt and Notre Dame. Both also play the rest of their sports (save hockey) in the Big East, but think there are enough non-BCS schools in the Big East to to make up for the loss in competition, besides, I haven't really seen the Irish put up a fight against the UConns and Syracuses of the Big East in basketball much these days. Divisional breakdowns as follows:
Nortre Dame Joins the Big Ten:
We all know the one big obstacle to this happening, but I think this would work out the best for the Big Ten and the Irish. However, NBC is not likely to give up its only college football game that it broadcasts. I do think however, I have come up with an interesting solution to that problem. All Notre Dame home games continue to air on NBC (at least until the terms of the contract expire), and NBC is allowed to show up to 2 more Big Ten games each week. On weeks where Notre Dame is at home ABC/ESPN gets the first 2 picks of non-Notre Dame games, followed by NBC, then ABC/ESPN again then the Big Ten Network and so on and so forth until all Big Ten games are scheduled. On weeks when Notre Dame is away or on a by week, NBC still receives the first choice of game, followed by ABC/ESPN, then NBC, then ABC/ESPN then BTN and so on and so forth until all Big Ten games are scheduled. Finally, when it comes time for the Big Ten Championship Game, NBC gets dibs since ESPN/ABC already has the Big XII and ACC (and I think MAC, but who wants to watch that?) they will likely want to air it at night to combat Big XII championship game. Finally, the divisions are set up as follows:
Eastern Division:
Penn State
Ohio State
M*ch*g@n
Michigan State
Purdue
Indiana
Western Division:
Notre Dame
Illinois
Northwestern
Iowa
Minnesota
Wisconsin
This set up allows for there to be an even split in the traditional balance of power between the 2 divisions and every current member still gets to play their 'Rivalry Week" team in the final week of the regular season and while South Bend is more east than West Lafayette and Bloomington, it is relatively close to Chicago and would tip the balance of power in the East.
Pitt joins the Big Ten:
This is probably the far more likely of the two seeing as neither NBC or ABC/ESPN would want to give up that much money and air time. This would also allow the Pitt/Penn State rivalry to well...exist again, and I know Penn State fans have been dying to get back to their annual romp with the Panthers and Ohio professional sport fans just LOVE the city of Pittsburgh so we wouldn't have a problem hating them.
Eastern Division:
Penn State
Pitt
Ohio State
M*ch*g@n
Michigan State
Indiana
Western Division:
Purdue
Northwestern
Illinois
Iowa
Minnesota
Wisconsin
This plan would also allow teams to play their traditional "Rivalry Week" teams on the final week of the regular season, protecting the integrity of the season, with one additional exception to the other plan. The "Old Oaken Bucket" would be an inter-divisional rivalry and we would have to worry about seeing an Indiana-Purdue rematch in the Big Ten Championship game (
ok, just kidding).
Possible Big Ten Championship Game location possibilities:
With a 12th team meaning a championship game between the winners of both divisions would be necessary, the Big Ten Championship Game would likely be at a neutral site domed stadium. The possibilities within Big Ten Country:
Lucas Oil Stadium-Indianapolis, Indiana
Ford Field, Detroit, M*ch*g@n
Hubert H. Humphrey Metrodome-Minneapolis, Minnesota
Given the uncertain future of the Metrodome I think it can be ruled out as a possibility, and the crime rate and overall not-good-ness of Detroit coupled with the fact the the Big Ten Basketball Tournament is already held a stone's throw away from Lucas Oil Stadium and Indianapolis' relatively central location, I think it would be the only logical place to have a championship game. However, I would absolutely love to see the BTCG played on a rotational basis of neutral site locations within Big Ten country. Places like, Paul Brown, Cleveland, Soldier's Field, Lucas Oil, Ford, Heinz, Lincoln Financial, and Lambeau. Could you imagine, in true Big Ten fashion, a championship game being played at Lambeau or Soldier's Field in early December? It would be incredible!