One of the less expensive stainless fermenters are the Chapman's (I have 2 fifteen gallon models from years ago; both are fitted with the 1/2" ball valve). Also at a reasonable price point in stainless are the SS Brewbuckets (conical in form, but no bottom dump). I have two of those in 7 gallon size with thermowell (which is handy if you fit it with heat or external cooling at some point). Finally, there are pressure capable fermenters - the Kegmenter and the Kegland All Rounder are two fine examples. I use those with floating dip tubes and really like the results and the ability to use a spunding valve and carbonate with a closed system transfer to the serving keg. Just a few things to consider. Of course the buy once, cry once approach would suggest the full blown pressurizable conicals out there with bottom dump valves or the Grainfather jacketed conicals with a very unique bottom valve set up.