I wasnt a fan of the top box at first either but when i was out west last summer i couldn't imagine being with out it. I have the 39L kaw box with matching trim, but they make a 47L one too. Any bigger than the 39L I would replace the rear rack with a metal one, the stockers are plastic and known to break. I still have the plastic one on mine but i keep a eye open for cracking. The side cases will hold more than you think. FYI a second one would fit in the lid if it wasnt too heavy...LOL As far as tunes go look into the Sena SMH-10 Bluetooth i love mine, you can listen to tunes, use hands free on your phone and even patch in your GPS Nav, and have bike to bike communication.