With dual clutch, is that still a servo-operated model?

Compared with the electronics that come with the (new) $575 version (http://www.aaftankmuseum.com/Kingtiger.htm), I think $300 is not low enough, unless you simply have to have a KT, and aren't concerned with the electronics.

Go look up what a DMD (think that is correct Tamiya name) sells for all by itself, and I think you'll probably agree, the $250 extra for a brand new KT (with I also assume are better gearboxes) is worth it. Tamiya folks please chime in if I'm mistaken and the DMD does not come with the tank. I believe it comes with everything short of the actual radio.

Or, wait until (if) the HL King Tiger comes to fruition.

IMO the Matorro one is ok (no offense Matorro owners), but the way HL has been getting better release to release, the next tank out from them should be a real good piece, hopefully its the KT. That is, of course, if a HL would do what you want it to do.