Not to support flippancy, but Driver basically correct. Buying on the used market becomes an art. Part of it is timing and part is research. Forums like this, audioreview.com, friends and exposure to various components all come into play. I live in remote Montana so listening before I buy is a challenge. There is 1 high-end dealer here and a couple of chain stores. I rely on internet info and I use the phone extensively ( I'm pretty good at distinguishing between manufacturers who are honest and helpful and those who are just full of themselves and thier products). Just like everyone else, I've bought products I thought were a good deal only to find out it wasn't really what I hoping for. Look around, ask around and DO YOUR HOMEWORK before you buy. Good luck.
What components are a good value in used market?
I just got old JBL L-series and I like the sound even compared to expensive modern speakers. I was pleasantly surprised to find that there are good sounding units in used market that are quite affordable. What other components are good ones to hunt down (under $1000) ?