I'm looking for a good bike-to-bike communication system. I'm at square one. Nothing in mind, no specific knowledge of any product, and no idea what is the best system to consider. As stated, the primary emphasis is bike-to-bike, over short distances. Bike to passenger would be a bonus, but since I usually ride by myself, it is not essential. The ability to add cell phone, gps, mp3 would all be bonuses, but again, not essential. Anyone have any good options? Any help would be appreciated.