Id go with forte and bell for right now, but I'm thinking you could buy low on Martin, MJD, and a top WR. I could see that side panning out BUT IT IS A GREATER RISK then taking the Forte side so if you are a risk taker pick the Martin Side if not be the Forte side!
All though on second thought, even though Martin had a break rookie year I was never completely sold on him and Forte and Bell have looked really great so far. i guess it would be hard not to take the Forte side.
I think it is close... I would rather take the colston side, because in a ppr league as long you do not have bad RBs, WRs are way more important... WR depth is great, and will definitely help you going forward... Also Martin is not that big of a downgrade from Forte, and TB is going to have good games occasionally...