To a West Coast guy with recruiting ties and a background there, Washington is a very appealing job. It's a major market (Seattle), a beautiful setting (Pac Northwest), loads of money (Microsoft, Starbucks in the neighborhood), and place where it's been proven you can win big.
For an Southern or Eastern coach, it has to be Tennessee, followed by Clemson and then Barn. UT has the statewide fan/recruiting base, ample money, decent tradition, and at least some recruiting appeal outside the region. Clemson and Auburn both share their small state with rivals from the SEC (though USC casts a much smaller shadow than UA) and both are known for somewhat delusional boosters and fans. The opportunity to potentially dominate in the ACC plus not having Bama and Coach Saban next door makes Clemson the more appealing of the two.
I wouldn't discount the possibility of the Penn State job coming open and jumping to the front of the line. Following JoPa will be tough, but whomever they hire will inherit a loaded team, a gigantic fan/booster base that doesn't need to be jump-started, and boatloads of dough.