Get a Dickinson Sea-B-Que. I have the small, but kinda' wish I'd gotten the larger one even though the small is big enough for me and my wife and is less problematic to stow.
I poked through the web extensively reading all the threads I could find on marine bbqs and though this brand is not mentioned as often as Magma, every comment I found was positive and I have been very happy with my choice.
I think you'd have to pay a lot more to get any better grill.
s/v Palmetto Moon
1991 Catalina 36