I just purchased a Schuberth C3W, which is a women's helmet but an older model. It is very light and is smaller in size than a unisex helmet, meaning less air drag in the wind (big difference!). The Sena comm system fits in/on the Schuberth nicely, and IMHO, this helmet is the quietest one I have ever owned. The lining and air vents seem to offer good ventilation when I want, and warmth when closed up. The sun visor is a must have for any helmet too. The peripheral vision view is critical as I want to be able to constantly check for traffic around and behind me while driving the RT. I prefer the modular helmet for safety versus half helmets, but that's just me.
The downside to a Schuberth can be the price ($$$$), but if you check the local motorcycle stores or at the motorcycle shows or rally's, you may find some good deals. If there aren't many dealers in your area to check out helmets, Revzilla.com customer service really helped me figuring out which helmets would work or not.