AoE Evasion Prime is very nice. I'll probably get raked over the coals for this, but I never liked RotF Leader Optimus. I don't know that I ever successfully transformed it more than once. It's good looking and well made, but not exactly what I'm looking for in a TF. My honest preference is for DotM Voyager Optimus. He's exceedingly simple, but he looks cool and can be flipped back in forth from mode to mode easily.