Orion Audio Blue Book has all the info. They can be pretty pricy though. You might check ebay for one that is a couple years old. I keep a couple around they are a great resouce.
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While what you are describing would best be suited by picking up one of the Orion's Blue Books (as previously mentioned) as it covers many, many years worth of gear from most major manufacturers, the ( now defunct ) the annual Audio Buyer's Guide was also extremely helpful in situations like this. While it only covered one years worth of equipment at a time, it sure was handy. Sean