I have the Shoei Neotec too and can highly recommend it. Had it for about 18 months now. Personally I found the fit much better than the C3 particularly across the forehead. The C3, for my head put considerable pressure there after 30 minutes wearing. Also I found the Shoei to be quieter at speed. The flip mechanism is easier to operate in my opinion as well with a simpler button and smoother action than the C3.
I got mine from justhelmets too so a great price, discount and a free helmet bag so all in all a good bargain!