I got the system from
www.motorcycletunes.com and I'm happy. this was the least expensive system I could find and the sound is good up to a point. At highway speeds, if you are alone (no traffic) and it isn't real windy, you can hear it pretty well. But if you are around other cars and you are getting alot of wind blast, it gets tough to hear. But like I said, I'm real happy with it.
I also agree that headphones are the best. But I end up getting a headache from them after a while. So I really prefer the open air speakers. Also...headphones are illegal in PA. I have used them for years and never had a problem. But find a prick cop and who knows...?