There is nothing wrong with the 1-2 punch of Jones and Washington. Part of the reason the Vikings selected Peterson was because Mewelde will be a free agent after this season -- making the risk of taking AP more feasible. Also, Peterson's success is PARTLY due to his ability to get holes EVERY play. Don't get me wrong, he does a lot of what he does by making open-field tacklers miss. However, being on the Jets wouldn't allow him to put up THESE numbers. The Jets need to address O-Line issues in free agency and draft someone not overrated (McFadden) -- who is not the 2nd/3rd best prospect in this year's draft, especially when, as stated before, they have a good duo already.
As far as Chad Johnson for Vilma goes, there is no way the Bengals would make that trade. All three of their starting LBs have gotten injured and will be back next season AND the cap hit they'd take would decimate their chances at competing with the Pats/Colts/Jags.