You could always get a Harley.
I bought two bullet water proof speakers and a 100 amp from Shark speakers for 52.00 for the set. The speakers mounted on the mirror studs and the amp mounted on the handel bars then all I have to do is hook my MP3 player into it with the cord that comes with it. Sounds great but if I had to do it again I think I would of gotten either the 150 amp or the 200 as head winds do make some songs hard to hear. Main complaint I have is the volume control is hard to work with gloves on. Other than that I love the system not too bulky but great clear sound. If your interested in something like this I can post the link to the site.
I have the same as Randy, we both have UniQcycle sounds. They are out of Colorado and have great customer service. I have the 150w amp down in the bike's tool box, just ran the speaker & power wires thru a hole that I cut in the top of the box. I then RTV siliconed the hole. I have had no issues and they have been on the bike for 4 years.
Trent and I have Polk audio speakers installed in the unique set up. They rock.