More important than Carbon fiber vs. traditional is the fit of the helmet. Be sure to get a helmet that works for your head shape, and be sure to try on the helmet first. You may be surprised that a well reviewed, technical helmet feels worse on your head than an inexpensive mass-market model. Bell Stars have a reputation for being a bit narrow, for example, and if you have a rounder head, you may want to look at something like the
Kali Naza Carbon for a carbon fiber helmet that is extremely well priced and a bit on the round side.
http://www.webbikeworld.com/motorcyc...le-helmets.htm has very good information about helmet shapes and reviews, but it won't substitute for actually going and trying one on.
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"Improvement makes straight roads, but the crooked roads without improvement, are roads of genius." — William Blake