Point me in the right direction...

I recently inherited a stereo system that I'm told is high-end. NAD 7600 Monitor Series Reciever and Celestion 700 speakers. I really have no use for this equipment, but would like to find out how much this equipment is worth or if there is a resell market. Can someone point me in the right direction? Thanks in advance for your guidance.
use ebay as a barometer
Good idea.. check completed items.
Buy the Agon Bluebook.
I'm interested in your Celestion 700, if you still have a pair.