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It's not unusual for RC's to have 10" or more back focus just check out RCOS and Star Instruments site.
If the GSO 10" RC comes in under $5000 AUD it'll still be more than $8000 cheaper than the one made by PlaneWave who make a 10" RC with CF tube
RCOS sells a 12.5" for $20000US
The only other manufacturer in the states Deep Sky Instruments sells a 10" RC with phelonic tube for $8000 US
At the end of the day the optics and rigidity of the CF tube and overall build quality will be the issue, focuser's can easily be replaced as can baffle tubes for that matter.
How many knockers were their when the 127mm Chinese ED APO's (which I believe I introduced to this site) could be purchased under a $1000 and so far I believe every one who has purchased one before the fall in the $$$ has been happy with the optics.
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