When making road trips during the winter, I usually wear my full face Viper bluetooth helmet. Its a convertible helmet that has a dropdown sunshield. It was tested on a harley @ 65mph, but at 80 its not very effective though. I got it on UK ebay for $200. 00. Its a VS-131 model made in Ireland.
Thinking about picking up one of the sena units but will probably wait for the versions with radio. I did find a group buy going on over at ADVriderhttp://advrider.com/forums/showthread.php?t=573145&page=68
Not sure what the prices are though since I can't pm the guy running it until the moderator activates my profile. Hopefully they will be cheaper than what i'm seeing online. I just wish the SMH5 units had an aux input.