+1 with the DS/crossover style.

I looked at heaps of DS helmets. Arai XD is nice, very rigid and with some great features (it should for the price). Usually ride with a Shoei TZ-something or other, but have to say that that expensive helmet stays in the garage now.
The Hornet DS is as light, just as quiet, gives great vision and the peak is invaluable (especially on the commute to work when the sun is either rising or setting). It is a little bit of a strain off centre in the wind, but not uncomfortably so (peak is smallish).
In the winter it is a bit draughty, nothing that a polypropylene buff won't sort out.
Some of the cheaper helmets are heavy, noisy and look not well put together. I didn't look at the Airoh, but it comes recommended. Might be a good compromise between price & performance.
Have you looked on ebay? Good option if you are sure of your size...
Cheers, Boneman