Vitor V Lyoto would be a good fight, Weidman also. I think the next MW champion will be Rory Mac though. Weidman will go to 205 after he recovers from the beating that Anderson will give him.
Weidman wouldn't have anything for Machida. I would think that Machida would just take Vitor down but if he stood with him he might get caught. Nevertheless guys like Okami, Bisping, Munoz, Boetch, etcetera would get stomped. Belcher/Machida might be a good fight or Machida might run circles around him; I am not sure.