I would buy the 70 amp cutters, for another 300.$ you would get more of and industrial machine,the consuables are probbly more , I would have too get a price by phone on the consumables, before i would buy one, the bigger machines are about 750.$ THE bigger machines are not really needed for building gasifiers. other than cutting burn tube or top plates with more dutty cycle,you could cut non stop over 1/8" with the bigger cutters. PS .The better cuters have dual voltage, they strike an ark with out grounding the tip of the plasma cutter, which reck’s the tip over less time. OR they call those machines piolit ark. IF WAYNE CAINT WARE HIS OUT ITS PROBLLY GOOD ENOUGH FOR GASIFIERS. I dought if i would need bigger than chris or waynes machine, not sure what price range they bought though.
PS I never owned a plasma cutter so not sure wich brand too buy.