If anything you will most assuredly get diverse opinions on this site. I would respectfully offer a different (maybe more factual) perspective on potential value of some of these products. It is my humble opinion that eBay may be your best bet. I speak from much experience selling there (and Audiogon) over many years.
Here are some facts: a Parasound 5250 amplifier recently sold (eBay) for $643.00, a Parasound 7100 pre-amplifier recently sold (eBay) for $400.00 and a pair of Triad Gold speakers recently sold (eBay) for $389.00. The point is there’s a lot more potential value to these products than you might think.