Yes, the Club section here on Audiogon is a good place to start. The old group I was in from the 80's has split into two groups now and both are still going strong. We have had a few members drop out since they didn't seem to have much depth or variety in musical taste or collections.
It's funny that one member who has bought most all of his music online as compressed has now declared that no more compressed music for him. He has heard the difference and now crossed over from the dark side.
My group has really helped me upgrade my system since one guy has Martin Logans and the other Maggies. Their fine tuned ears have helped me improve my system 100% plus I like some of the music they play enough to go out and by it for myself.