Haha, I don't think some people understand their own collecting patterns.
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If you had to pick only one figure from the Movieverse to get, it'd have to be any form of RotF Leader-class Optimus. That figure is the definitive piece in showing how to make the movie aesthetic translate into plastic molded form, from the engineering required for the transformation to the screen accuracy. Just comparing it the first film's Leader-class is evidence enough, but stick a photo of Prime from the actual movie between them and you'll see what I mean.
The one thing I don't like about ROTF Leader Prime though is how the blades interfere with the arm articulation when they're retracted. Otherwise he's a sweet sweet toy. TF1 Leader Prime is still a really nice toy in its own right though.