Man, I don't know about the whole washdown thing. I would lean toward "marine-only" types. I know infinity makes some. I would probably go Infinity if I couldn't do Eclipse for some reason. My local Eclipse dealer is awesome and always offers to "warranty" stuff, even though it's 7 years old.
I haven't needed the warranty yet.
I am not afraid of car speakers in the boat, as none are facing up, toward the sun / water. They are down along the feet, but we just wipe the floors anyway. No water spraying. Additionally, with so much freeboard, we don't take water over the sides or bow anyway. These Xplods had lasted 4 years, so I would expect at least that from the Eclipses or Infinitys.