I'm for Arai too. I also use a gp5w with a smoked shield. Its a nice helmet, wide angle viewing is a plus, its comfortable (for me) and light. I'm an arai fan - use them on my bikes too.
Get prepared to pay through the nose for the gp5w, but hey, its your head.
I would not go open face, unless of course you dont mind your face bashing into the steering wheel.
If you feel claustrophobic in a closed face, dont worry, you will get used to it.