I've done it before in this thread, but since it's 100 pages plus now, I'll do it again.
My position is this:
I would give up a 4th round pick this year, and a conditional pick in 2016. One that could range from another 4th, to a 2nd rounder, based on production. It gives the a vikings something for giving up by far their best player, but still leaves the Cowboys plenty of draft resources to continue to build and improve.
I would give Peterson a 3-year, $25 million contract, with half of that amount guaranteed. Peterson effectively gets his 2015 salary guaranteed (which he doesn't have now), Dogra gets another 3%, and the Cowboys actually improve at running back.
The deal would be backloaded to give us some relief now and leave us with about $5 - $6 million in dead money at the end, giving us and Romo a 2 year window to win a championship.
If it doesn't happen before both are gone, at least I know I did everything I could and took my shot.