Of course around these parts love of the Fire Convoy mold is a given.
It was RID Optimus Prime, along with Team Bullet Train and Wedge, that got me into serious crack addiction back in 2001 or so.
Remy Rodis' 6" Titantium RID Optimus Prime gallery is fantastic!
Sure, there's a lack of detail due to the size of his head and all but I'm not going to let that ruin him for me.