Before you upgrade, make sure you are aware of the helmet requirements of the tracks and racing governing bodies you will be racing in - they may only permit SNELL. Been awhile, but back when I rode, SNELL had helmets certified for motorcycle use, and believe me, I have had the misfortune to prove the efficacy of SNELL rated helmets more than once, and if you get in a situation where the SNELL rated helmet won't protect you sufficiently, you have much bigger worries (and chance of death) than what protection a helmet gives you. Just a sad fact of crashes in life - head injuries aren't the only cause of serious injury or death.