As has already been mentioned, you will need to spend similar on the mount. If that's no problem, have a look at the Tak FSQ or the Televue NPis as well. What you might also consider at this end of the market are the very fast Riccardi-Honders designed astrographs. Not a refractor, I know, but photons don't seem to care whether they're reflected or refracted.
Of course, you should probably keep another 10k or so handy for the camera and filters that will get the most out of this gear.
It's fun spending other people's money!
Best wishes,
Andrew.
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