Go to a brick and mortar store and listen to it. Go to Stereophile and The Absolute Sound's website and find out what they recommend. Their reviews and description is better than any 5 line description here - mine included, hah!. Then think about your budget, and the sound you like. Stay away from "vintage" high end gear (i.e., Levinson, Krell, etc.) that has not been serviced, and that has not had all the old capacitors replaced. If you must buy vintage high end gear, look on a website like George Meyer's site. He's an authorized Krell fixer-upper in the SoCal area. In any case, happy hunting!