Funny you say that, but I have a PhD in composite engineering, and have worked in the field for a few years and can get it suprisingly cheap...so carbon was mentioned!!!
Also my mate has worked on machining items for the atomic/R&D field...so he wanted everything in stainless or some other more fancy bling!
This was after a few beverages though!
[Edited on 23-2-2005 by Harv748]