I second FansProject's Protector and City Commander armours/trailers. They make for fantastic Rodimus and Ultra Magnus figures.
Also Maiden Japan and Luck Rogers both make kits for RTS Wreckgar and all the repaints. Less is more if you're army building with these kits. By picking and choosing piecemeal armour, one kit covered three junkions, I can stretch this to four or five if I start switching arms and legs so none of the junkions are identical.
Any figure that comes with swords demands wrist articulation.