i am thinking about getting an openface ( 3/4 ) helmet. maybe an hjc ac3. what do you use

I like Nolan's for 2 big reasons--their ratcheting closure system and their N-Com system. I hate fumbling with d rings. The downside is you cannot use a d ring to lock your helmet onto your bike because there is no d ring.

Hitec 1

I use a KBC touring helmet from Chrome World. They come color matched to your bike and can be fitted with a built in headset. They do not have a built in visor but I don't use one so it's perfect for me.