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I have similar "brassy" looking parts on my Skywatcher refractor. For some reason, some (not all) of the originally-black plastic bits tarnish to a brassy appearance. This is not a problem, just some inherent property of the plastic used.
Also, regarding a cooling fan, the cooling fan from an old desktop PC could be readily adapted for this use. They operate at 12V DCand run readily quietly and are virtually vibration free. Could easily find one put out for a council cleanup and buy a 240V AC to 12V DC adaptor at Dick Smith for a few$'s.
Go for the 10" - aperture wins every time.
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