Best way to determine value on 80's-90's oddball?

What is the best way to determine which 80's-90's oddballs/inserts are actually hard to find and desirable? Obviously, Beckett is worthless when it comes to this as I often see some of these cards go for way above book when they are sold, ie 90's refractors. One thing I have been doing is searching the particular card I am wondering about on Beckett marketplace and comparing that to the listed book value. Of course, this system is highly flawed as asking price is not a sale price. So do you guys have any other way to determine what cards are actually in demand by player collectors besides watching eBay?
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<< <i>So do you guys have any other way to determine what cards are actually in demand by player collectors besides watching eBay? >>
Or... look at the registry and see if there are any common gaps in the various player collections.
WTB: 2001 Leaf Rookies & Stars Longevity: Ryan Jensen #/25
Even with BIN listings that don't sell, at least you can get a gauge of what other sellers think the card is possibly worth.
<< <i>The best way to determine the value is by how quickly it burns when put in the fireplace. I've noticed that 1987 topps burns nicely. >>
It's because of that awesome wood grain border.
Always buying Bobby Cox inserts. PM me.