As a follow up I tried one of the Schuberth J1's and bought it on the spot. It's a 3/4 helmet with a detachable chin-guard. Quite light, well ventilated, protection pretty much as good as a full-face but nowhere near as claustrophobic, drop down visor to reduce sun-glare, and noise deadening acoustics so good I couldn't hear the stock pipes at all (now running TORs, so nice warble). Pity it's not over in the US yet, it is a great lid.
the link:
http://www.schuberth.de/
An image:
