I would make this trade. Gates has receiving talent around him and an elite QB. I don't see much opposing Ds can do to make a significant dent in his numbers. Best on the other hand has no one. If you look at his stats, he has been getting TDs but very limited yardage. And this is coming from a huge Cal fan who was super high on Best to start the season. Hillis is the man in Cleveland and should remain a very serviceable RB2 for the rest of the season.
QB - A Rodgers, E Manning
RB - A Foster, S Jackson, R Mendenhall, T Jones, R Bush
WR - G Jennings, L Fitz, S Smith (Car), P Harvin, V Jackson
TE - A Hernandez, J Tamme