I sold my mint condition black laminate 100 v2s about 6 months back for $900. I actually didn't expect to get that much, but found a local buyer who was happy to pay it. IMHO $750 is an OK price if the dings are not too bad. Is your room really 65' x 20'? That's pretty darn big. The Adcom is only a 100 WPC into 8 ohms. You can give it a try, but unless you listen at mostly low volumes, I think you're going to want a bigger amp. I tried a number of amps with the 100's & never felt any with less than 200WPC drove them well.
-Dave