I use Collett 900. Our entire group does. Easy to use, pretty clear and each time a new guy comes to the group his new communicator will work with the older one. Mine is from 2002 and my best friend started riding and his new model works right with mine. You can also use a seperate club channel. The only problem in the past was customer service. My last call to them this year they seem to have drastically improved the service. Replacement parts are cheap too!
Kevin