helmet recomendations

[Reiner Fink <reinerf@microsoft.com>]

Hi all,
Before the 18th I need to purchase a helmet for driving at Portland with
the NWRAQC. What I wanted to know is do I really need a full-face
helmet, or will an open-face one suffice? I plan on taking my A4q to the
track as much as possible (5 times/yr I'm guessing) and another step up
is going to a kevlar helmet. Is the lower weight of kevlar worth the $70
step up in price? Is kevlar safer as well? Right now I'm leaning toward
the Bell mag4 (open-face), and am undecided on wether to spend the extra
$$ for kevlar. TIA,

 -reiner