Not sure if a 2000 makes the vintage cut, but it is steel at least. I came across this by chance and am not sure what Im going to do with it. I would likely sell it for sure, except that I found two areas that have been touched up on the frame upon closer inspection. (see pics)
As long as the touch-ups aren't concealing major damage they shouldn't affect the value too much. If you sell, probably in the $300 to 450 range. Not too bad for a 853 frame with a carbon fork. Try riding it before selling, you might like it.
The frame and (is it carbon?) fork look fine to me. The late 1990's/early 2000's Zurichs are outstanding road bikes. I really like the ride of
my 2002 Zurich, which also has an 853 frame and carbon fork. I think that Zurichs from this era are every bit as good, in terms of ride quality,
as modern bikes costing much more (the original Zurich list prices were in the $1800 range). You can find them used in great shape in the
$500-900 range. Most came equipped with top-end Ultegra components.
I also like the fact that these Zurichs are Made in the USA.
I have a 2001 maillot jaune, very similar, I think the only difference is some pearl in the paint. With that said, I would ride it if I were you. I have nothing but great things to say about my lemond, I currently have an ultegra sl group set and ksyrium elite wheels on it for a weight of 17.5lbs, and id say it rides just as well as any sub 2000$ bike I could find. So to answer your original question, you'd get about 350-450, but I'd say the frane quality is worth that of steel frames that generally run 600-800, in my opinion. Good luck.