Off the top of my head....
East:
Ohio State: They will be the #1 team in the country IMO.
Michigan State: Major questions about who replaces Cook, Langford and Lippett. But who else can challenge them?
Michigan: Yes, I think their talent will get them this high, regardless of who they hire as a coach. Super young line this year decimated their offense, but will get better.
Rutgers: Team on the rise; replacing Nova will be no small task, but Caroo should be back and very good.
Penn State: Depth issues remain, and will for a little while longer. Good young talent on the horizon though.
Maryland: A team that was not really all that good this year, and won't be all that good next year. Their schedule (at WVU, at OSU, at MSU, at Iowa, home date against Wisconsin) is brutal as well.
Indiana: This team will be a dumpster fire, even with Sudfeld back.
West:
Wisconsin: Clement just another in a long line of good/great backs. They should reload and will probably start the year ranked (of course getting absolutely gobsmacked by the Tide in their opener).
Minnesota: Bringing back experience on the lines, QB, WR, defense in general. It will be another improved team (even if the experts don't think so given the loss of Cobb).
Nebraska: Who knows with the new coach. I could see them anywhere from 2 to 5. I'll give their athletes the benefit of the doubt and put them here though.
Illinois: Surprise team of the conference. Lunt comes back for a full season, and puts up gaudy numbers in their offense. Not going to be a gimme.
Iowa: I see nothing to excite me, but nothing to really doubt them doing their 7-win thing again.
Northwestern: Is the Fitz honeymoon over? Jackson is going to be very good, but is the rest of the team anything to get excited about? 10 wins seems forever ago.
Purdue: It doesn't get any better for Hazell.