As hinted at in the ID/Help thread, I have picked up Cybertron Metroplex.

He doesn't have any accessories - not even his head antennae - but that's OK because I plan to customise him, either to G1 Metroplex (but then I'd need those antennae... and paint him white. White paint is evil!) or Fortress Maximus. There are some beaut versions out there on the net.