I am as happy as you can be with a solution. Its still not perfect and still isn't quite bright enough to see with sunglasses. However it is without them on.
Some folks are doing this.What if instead of aftermarket radio, you just get high quality Bluetooth waterproof speaker system, and listen (to I-Heart radio) using your smart phone!!!
I am thinking of installing great speakers (solid bass and all), and having an iphone-ready cable come out from the cubby hole and plugin to my phone. I could care less about bluetooth, since my iphone will be mounted right there anyway. Wouldn't that serve the same exact function as a head unit?