Without speaking for the entire community, you'll likely find that most folks are using FRS (Family Radio System) radios, i.e. Motorolas, Cobras, Panasonics, etc. Available all over the place, from Walmart to Costco.
Headsets? Ranging from hands-free set-ups sold next to the radios, to knock-offs of real world comms gear (or, indeed, the actual real world comms gear. Lots of styles and manufacturers, but our little group is gonna get a few like this...
http://www.dragonredairsoft.com/airs...roductID=26967
I figure they'll keep the bugs out of our ears in the summer, and keep our ears warm in the "spring" (such as it is here) and fall.