I got my Bell M2 from Helmet City (http://www.helmetcity.com). I concur with Lawrence on the M rated helmet. They cannot be used with NASA or POC I believe. There is more of a construction difference between the SA and M ratings than Nomex from my memory. I don't think there is a noticable difference between my M2 and my old M-rated Shoeis or Arai regarding visibility. I would definately try them on before buying.
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Adam in Charlotte
1987 944-S
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