302/304 ? most popular, excellent corrosion resistance, Tinsel Strength (TS) 75,000-355,000 psi
303 ? has sulfur added to facilitate cutting and bending, TS 95,000-135,000 psi
316/316L ? More corrosion resistant than 302/304, TS for 316 is 100K-140K and TS for 316L is 185K-265K
410 ? is heat treatable, TS is 70K
430 ? not that different from 410
302/304 is probably the cheapest and more applicable for what you are trying to do. The thicker the diameter the harder it will be to bend. I use .051 302/304 for saltwater.