Shoei RF-1000. Best bang for the buck imho. But you need to try them on...some people have a Shoei head, others an Arai head.
http://street-bikes.ridegear.com/cgi-bin/SoftCart.exe/shop/Full_Face_Helmets/F-10662_RF-1000_Solid_Helmets.html?E+scstore
this is my subtle yellow one:
