What is the most reliable price guide?

What is the most reliable price guide? I have been a member of Beckett for some time now, and there prices are over inflated. I buy and sell FB,BB,BB, and hockey modern, vintage, graded, and ungraded cards. The majority of my cards are post 1980.
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<< <i>ebay.com >>
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How do you look up past sold items on ebay. I looked under andvanced search and there was nothing that let me search auctions that have already ended.
<< <i>After you do a regular search there's a box on the left for "Completed Auctions". Check that box and the search button. >>
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Thanks. I have been a ebay member for almost 9 years and I've never noticed that.
best indicator is ebay past sales.
edited: sorry, didn't see the "mostly post 80's" Above is supreme for vintage though.
ebay i.d. clydecoolidge - Lots of vintage stars and HOFers, raw, condition fully disclosed.
Doesn't it seem like Lee is always 1 step ahead of Big Brother?