Finished during my lunch break. For the surf, I used Digital Carver's Guild excellent (Shader Ops) Terrain Tools which includes a Surf and Intersect feature. You can make materials automatically conform to coastal lines and add the noise of your choice to create the variation. 

I'd mentioned using the ocean I used was from the image above this one with the oil rig. (download the image and play) However, I really increased the both the transparency and absorption distance.

For this top-down shot, I used an HDRI map in the background that had a bunch of white towards the top so the water would reflect better.