Recommendations for new radio / head unit?

Unfortunately, there is no such thing (yet) of a fully waterproof true double din stereo. The Sony AX-100 seems to be water-resistant but their warranty specifically calls out water as invalid.

That being said, I went with the Kenwood DMX-905. It has front and rear camera support as well as you can control their dash cam through it. I can attest it survived a couple rain storms unscathed (right wokka?) but it is not guaranteed.

My previous one was the Pioneer MVH-300EX but it did lose capability to mute and lost some led button lights in 1 rain storm.

There are some "splash covers" out there but I only know of 2 people working on a waterproof cover so far (not fully released yet).

I have the Sony AX-100. Works great! Has gotten really wet and still works. Contact Shawn at http://www.Slingtunes.com. He has some really good stuff and he is extremely helpful.

Pioneer Avic 8200 All day !