Need some fantasy football advise?

I have DeAngelo Williams, Julius Jones, DeSean Jackson, Randy Moss, Devin Hester as my RB WR core players. The only TE worth anything on my lineup is Bo Scaife which is sometimey at best.I have Titans D/ST and Pitt D/ST. A guy in our league has Matt Forte (as untouchable...but I think I can sway him) and Jason Witten. Would you trade Randy Moss and Pitt D/ST for Matt Forte and Jason Witten? Thanks for your help