This year's 8-4 team is arguably better than the 10-4 teams under Rhule. Like I said in another post that has gotten lost in these 170 pages, win/loss record doesn't tell the whole story. They're very, very stout on defense and turned around their offense (and season) after a couple bad losses to start. I mean, statistically, this is one of the best teams they've ever had. The 8-4 record is worse than it seems.
To be frank, there are not really a lot better coaches available that fit your desire for experience. The only possibly better option I could see is Malzahn is he is fired (rumors still out there). But even then Malzahn carries a fair amount of baggage.