Well, not sure about 'on topic' range bike, but Calfee actually has a lightweight modern gear equipped bike they've done in (wait for it) Bamboo ... They also call it a 'serious bike' and it does look pretty good - available in a variety of finishes, too:
http://www.calfeedesign.com/
Bob (running away from work to RIDE) Hillery
Stratham, New Hampshire, USA