I bought a JET wet horizontal bandsaw, for cutting a lot of material any size up to 7x12" overall its the quietest, cleanest, and fastest for mass amounts of cutting. I go through a couple blades a year with average amount of use, and I dont have to babysit the thing while it can cut 8x of the same thing in one pass. Its paid for itself over and over.
Chopsaws I find are good "on the fly" tools in a small setups or wherever you need something portable, though it can be obnoxious when I cant finish a cut on something a little oversized
Plasmas are great for cutting thick or thin shapes from sheet, though I find the torch a more universal item aside from cutting if all I do is steel work
Most of all I try and use whatever tool can make the cleanest cut with the least amount of me doing the work
