Now, if you really wanted a vinyl boy that can go posing toe to toe with the 50cm... there is the 45cm. It's got the same internals as the 50cm. I think. I'd have to check on the middle waist piece, and compare it to the 40 and 50cm. >.>;;;
But, overall, same posing ability.
Unfortunately, this one is designed to be paired with the 40cm. What COULD be done, if you want a taller boy, is simply swap the upper halves of the dolls. Grab top of doll, rip off, cram on other body, then swap arms. Voila! 50cm boy, and 45cm girl. ^.~
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From the few shots of the 65cm boy that I've seen.... five to one, it's just a re-skinning of the 65cm girl. -_-;;;
Grey, I'm betting that all obitsu did for the 65cm, was just elongate the limbs. Which would be why the doll itself is so 'glitchy'. It's got all the problems that the 60cm has, plus a bunch more joint-stress from being elongated.
<3
-Kiki-chan78.