Just out of Curiousity... Carbon

IMHO carbon just doesn't look and feel as nice as a good steel frame. Might be useful if you wanna shave off miliseconds off your commute but most people on here like the feel of steel and aren't bothered with having the latest in unobtainium drivetrains.

the thing about steel is that it doesn't take much to make it light and strong, unlike other material such as alu.