As Tim says, I own one of the replica frames from a couple of years later with a few detail differences. To me this frame is more desirable than mine since it's from an era when Lemond was a top 10 contender - this is the model he used in the 1991 tour. It also has the more interesting carbon wrapped brake bridge rather than the machined alloy part mine has and the blue clear coat rather than the clear on mine. The fork is likely an early Kestrel EMS.
I'm very happy with mine, it's a nice smooth ride but feels quick despite the heavy C-record kit I've built it with. The frame construction is a work of art. I vaguely remember paying something like £800 all in about 3 years ago for a complete bike with random shimano (9sp Dura Ace + Ultegra hubs + 105 cranks) / old campag parts thrown in.
Personally speaking I think £500-£600 is a good price with £800 being a bit on the pricey side. At the time I purchased mine I would have definitely been bidding on this.
For comparison, a perfect condition Clark Kent made Lemond titanium frame from the same era went for £537 a couple of weeks back and I've seen Lemond branded TVTs go for similar money. I personally rate the Calfee made frame above both these in desirability terms, but of course that is a subjective personal opinion no doubt formed reading copies of cycling weekly/plus when I was a teenager! I think the TVTs would be more valuable if they had a better reputation for staying glued together!
PS, the link you posted is incorrect. Here's the correct one:
http://cgi.ebay.co.uk/Lemond-full-carbo ... 3cab4f1d65