I dunno as good as a pass rusher Peppers is Id still have a hard time taking him over Vince. Its hard finding elite NT's especially ones like Vince who are so good off of the field too. I think its easier to find pass rushers that elite NT's.
I agree with you on Vince. He's a heck of a player. If you look at the composition of this front 7 though, and replace Vince with Peppers, it starts looking like a 4-3 team. Warren can shift to DT. Brace, Wright and Pryor are all better as 4-3 DTs. Mayo might be better in the 4-3 as well. Just a thought there, as the offseason unfolds.