Hi Handy1!
The Schuberths do not fit me, so I've been through HJC, Shoei Multitec and Neotec (1 and 2).
There is a good review about the new Schuberth C5 and some history on the C3 and C4 models at Motolegends (UK shop): Schuberth C5 helmet review
Good luck with your decision.