I put Priest at #2 in dynasty or keeper. He's got a backup with solid potential, and he's got at least 2 more years, if not 3 in him. Given that he's the best ff RB, its impossible to pass on him for anyone but LT2.
Portis, could've been #2, but the change of teams is a worry. Tougher run defenses in the NFC east, and Denver has about the best run blocking o-line, so he won't necessarily put up as good of numbers as before.