I am interested in selling my Klein, it is a 2000 Klein Attitude Race in blue in VGC, I have owned the bike from new and have all the paperwork and Klein manuel to go with it, it also has all the original components.
Again, it won't be worth "Klein money" as it's not a pre Trek model, which are the really sought after ones. It's basically a Trek with Klein badges (which isn't a bad thing). It'll still be worth something. Maybe a couple of hundred if it's in good condition.