Need an RB - Cooper for Mixon - full PPR Dynasty

I’m looking to pick up Joe Mixon on the cheap, or even Kenyon Drake due to slow starts. I was thinking of offering up Kenny Golliday or Amari Cooper. My WR core is solid. Am I offering too much? Or too little. I can sprinkle on Brandin Cooks as an added incentive and try to get a rookie from him as well. Thoughts?