I manage to snag an XSP-II delivered for $320. Best helmet I've ever owned. My Arai Quantum is a joke in comparison (and I HATE that shield system... WTF is up with that??).
One of my previous helmets was an RF700 which I really enjoyed bu this XSP-II is so vastly superiror to both the RF and the Quant.. I can't imagin bying a low-line helmet ever again.
It also has the removable liner, excellent vents (probably not as good as an AGV X-vent but still really good IMHO).
This is the one I got:
Try motoxoutlet.com that's who I got it from. They might still have some clearance models in stock.
I don't think you can go wrong with Shoei.
EDIT: It also comes with a factory smoke shield and a nice lined bag. Now, wheneve I look at the Arai helmet and accessoried, I just laugh.