Sorry its not our job.
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On this very site, click on "Insider." There is an offer for a subscription that costs $10 a month. That subscription gives you access to the Audiogon "Blue Book." This is one of the most authoritative source of information on used gear value.
The gear you are trying to sell is top notch stuff. If you have any interest in a good sound system, you should keep it; it would be quite hard to assemble a similar system for anything short of a small fortune.