Bearing in mind that I have little upon which to base my thoughts, I also like Whis and Jay Gruden as possibilities. Whis has had offensive success, has NFL HC experience, and did a nice job in AZ when he had a QB to work with. Jay has similar offensive success, has been in the NFL a while, and maybe was a head coach of a UFL team? Both are relatively young, seem like the type of guys who would command the respect of pros without turning them off (a la Chili), and seem to be the type of guys who could work well with what they have (rather than showhorning mismatched talent into their pre-conceived schemes).
McDaniels tenure in Denver worries me, although admittedly here he wouldn't have personnel responsibilities, which doomed him there. Still, he makes me a touch nervous.
I'm assuming Jon Gruden would want more control than the Vikings would be willing to give.
I'll quite following the team if they hire Shanahan, although I doubt there is any likelihood at all of that.
Truthfully, though, I would be most interested in the team if they brought Tice back and drafted Manziel. Not saying at all it would be even a smart move (although I think Tice could be decent in the right situation, but I would follow every second of it. The entertainment level would be off the charts, and I guarantee the team would play their asses off.
"You guys are true athletes!"