Anyone have a preference and why? I have not seen really any reference to Simpson helmets on the list. Are they bad for some reason? I'm leaning toward the Bieffe Predator- SA2000, removable Nomex liner, $350 or so. What do you all think? Then again, depending on if they have the size I need, I can get a Bell M2 for $270 at Racer Wholesale. Taka