I bought a Giro Remedy S at the end of last season ($100 for a $300 helmet - nice!).
Anyway, I haven't worn it snowboarding yet, but I did buy it to protect my jaw/lower face when riding trees or rails.
I tried a Ruroc last year and couldn't get comfortable wearing it.
The Remedy S is AMAZINGLY comfortable!
I got the largest size, and I wear a 7.5" hat.
You may want to look into it.