Shoei.

The SparX Red Corsa.  Cool looking and very light, third lightest full face on the market.  Great quality at a great price.  I like it better than my Suomy and it is ECE rated.  Good reviews at Helmet Harbor and webBikeWorld.

I've only worn Shoei until recently.  Switched to Scorpion.  I like this helmet better than the former Shoei.

comfort, fit, venting, and removeable padding win my $.

But oh, I want Zemke's helmet so BAD!!  Angry killer racing carp!   

I've had Shoei, Arai, Nolan,and an HJC.  I like the shoei and arai best.

WBW has some great insight on helmet shape and which companies produce which shape.
http://www.webbikeworld.com/motorcycle-helmets/motorcycle-helmet-faq.htm

British government helmet rating: http://dft-1-sharp.eduserv.org.uk/