If yeast harvesting or dropping trub isn't part of your plan and you are looking at volumes less than 15 gallons, consider getting up to a 15 gallon cornelius keg for a couple of hundred bucks. Cut an inch off the dip tube and put a collar on a chest freezer to control fermentation temperature. At this volume, the shape is not important if you're not dumping trub or yeast out the bottom, it's stainless, has a keg lid to access like lots of the conicals, is easy to do closed transfer with CO2 on the gas line, and is easy to clean with a PBW soak.
Only downside is the weight. Had to put casters on the chest freezer and roll it to the brewstand with keg in place to fill after brewing. But have used it for several years with great success.
