I have a pair (actually 4) of Cardo BK-1 headsets for my family and they work GREAT! They retail for wads but I've found the pair on ebay for 180 before.

Technically, you can pair three of them on an open intercom but I've accidentally gotten all 4 working before. They're voice activated and the wind filter is fantastic. I also use the bluetooth feature to pair my phone and I've taken phone calls while riding and the wind noise is apparently quite minimal (according to my wife). Up to 20 mph and they still work well. You can also stream music from your phone if you're into that sort of thing. I prefer to save my battery.

cardo BK-1

There's a pair on fleabay right now for under 200. Cardo BK 1 Duo | eBay

They look a little dorky but my son loves them because he can chatter up a storm while we're riding. I can also give him tips and pointers while we're riding, coordinate stop signs and all that good stuff. The range is something like 500 yards.

I'm not affiliated with them in any way, shape or form but a friend of mine got some first and raved about them and I haven't regretted getting mine either.