The warm weather will be here in a few weeks so its almost time to do some bike riding. I'd like to get a speaker that's mounted on the bike. That's a little safer than wearing headphones (I wear one while riding) and I also don't want to worry about them falling off and into the wheel (yes, it's happened). Maybe a Bluetooth unit so I can keep the phone in my pocket or if the phone would be attached to it, something that will keep it safe. Also don't want to break the bank so price is a concern. Thanks!