Beautiful bike for sure!
I recently got my first Klein also. A Quantum II with some decent Campagnolo parts. I haven't done much to it since getting it. Upgraded record brakes, some lighter more compact Deda bars, couple of bottle cages, and then today I put on a Fizik Aliante 00 that just arrived in the mail. The saddle pushed the bike under my 18 lb goal by a full oz, LOL!
Seriously though, I love how fast yet comfortable this is out on the road. It's got some honest wear but man the original paint is quite sweet on these. I love the ride so much I'm thinking about looking at getting a Cannondale even though I'm supposed to be downsizing the stable. There's a CAAD8 Optima in patriotic red, white, and blue colors that caught my eye. Can't find it in any of the catalogs but it's supposed to be a mid 2000 bike.
Anyway, here's mine after I threw the new saddle on it today.