Unless you have unlimited funds, go by price. All the marine grade stuff is pretty good, but also very expensive.
Here's some more stuff: http://www.parallaxpower.com/MiscInf...n%20Panels.pdf
And a notice to anyone interested: my local Menards is getting rid of old stock, they have a bin full of 50amp GFI breakers for $25.00, if you are interested I will stop there next week and grab one for anyone that speaks up. They are GE THQL.
I will trust you to send me a check and pay postage.