Air Rider
Intaride
Starcom1
align.
Baehr
I have a Starcom. i like the looks of the Intarider because the connection at the helmet is much easier to use. Starcom, Motocom, Autocom, Baher all use a mini DIN connector that is awkward to align properly. The intaride is a single pin with multiple rings so only one thing to align. Much quicker and lots easier to do.
I did not know about Intaride when I bought mine.
For simple bike to bike a FRS/GMRS radio that has VOX and a helmet headset is all that's necessary.
clearcom
Edsets
Starcom, Autocom, and motocom also sell headsets only.
The FRS/GMRS radio also has alot to do with the useability of this kind of setup so don't scimp on that part if you want reliable communication.