I don't know about which stereo would be better than another, but I was gifted with a cheapie unit with with CD and lots of bells and whistles 4 years ago. It is mounted in the cabin and like your boat, the bilge is just below the planked deck so humidity and moisture are for real.
I installed the unit in one of the plastic houseings with a hinged face cover available from Bass Pro and other places. It seems to have provided enough protection to keep the unit from corrosion--I havent seen any at all so far. Perhaps you would consider one for your installation.
budc



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