IF Peterson is available in FA, and if the Cowboys could work cap-friendly deals with Peterson or Murray, then I'd prefer Peterson. If I could have Adrian Peterson, healthy and in top shape, even at 30, for three years vs. Murray (whom I really like) for four years, I'd take Peterson. The guy came back from knee surgery in record time and, with no bonafide passing game, came within nine yards of the all-time rushing record.
Demarco Murray is a very good all-around back, in the top five in the NFL. But Adrian Peterson is a future HOFer. He is the best back, bar none, of the past two decades.
Tony Romo is the Cowboys' best chance for a SB victory. If he was 30 or even 35 with no history of back surgery, I would not be so adament about winning NOW. Roger Staubach led the NFL in passing at ages 36 and 37. He was forced to retire in 1979 for medical reasons. However, the window for the Cowboys did not close immediately because Danny White was waiting in the wings, and so the Cowboys were a SB contender from 1980-82 with White at QB. There is no Danny White sitting behind Romo now.
Peterson behind this line with Dez outside to keep defenses from playing eight man fronts would be a thing of beauty to watch. He has more power than Murray to break through tackles and much better top speed to outrun LBs and DBs. Long runs by Murray that end up in kicking FGs would, with Peterson carrying the ball, end up in the Cowboys lining up for PATs.
It has been a long drought in Big D. When Romo retires who knows how long before the Cowboys are real contenders again.
I may be in the minority here but IMO if we can get AP go for it, and go after a quality pass rusher in FA too. Win SB 50. And 51. 1995 was a long time ago.