My current project is getting Rustoleum Marine Topsides paint. It's $14/qt. Most box stores whose name starts with M and feature green as their representative color carry it. According to the tech line it's the same as their regular stuff, except it has more UV blockers and color stabilizers. Regular Rustoleum was originally designed as a marine paint. As long as you're not storing the boat outside regular Rustoleum is probably fine. Easy on, good results IF YOU FOLLOW THE INSTRUCTIONS EXACTLY, and easy to source more for repairs.

Amazon has Rustoleum Marine for $12 a quart (at least in white). I'm using some on the hull of a SOF. I rolled it on with a 1/8" nap "hotdog" roller. It was very nice to apply. I think I like it better than Brightsides.