Here is a bit of a run down of how I do my paddle board fishing with a budget inflatable paddle board. I had it for about 4 years and quite enjoy fishing with it. It opens up a whole lot of options for fishing if you're otherwise shore based.
cheers, well I got this aqua marina on special a couple years ago for about $500NZD which is somewhat around 300USD Got a lot of good fishing time out of it since then, so I'd say it was worth the investment
Any brand should do, but I would recommend to get at least 6inch thickness for better stability when carrying gear around.