They'd be silly not to call Greg Schiano first. He may have better offers coming though.
Would agree with Fleck getting a call, seems like the type of gig he will get next. He's not quite in the market for a top P5 gig. A lower tier program is probably where he will end up, whether it's Purdue or a comparable school.
Obviously Neal Brown is another newer name that will be drawing interest. Won't be long before Major Applewhite starts to ping on a lot of radars, if he hasn't already.
However, If I were Brown, Fleck, or even Brohm I would put my name in the Houston hat. Great situation there. Stable, competitive, and nationally recognized program now thanks to Herman, Sumlin, and Briles. Easy access to the best talent in the country. No starting from the bottom and having to totally change a culture. No conference top dogs to compete with. Very easy way to catapult your career. But I digress, back to Purdue.
Boilermakers seem like a Brady Hoke type of program. He's a mid western guy who's already coached in the state of Indiana, and the big 10.