I use a 10quart dutch oven which lets me end with 150-160 lbs of cleaned alloy. I use a turkey fryer with a little taller legs so I don't spend so much time bent over stirring and scraping which is key to clean alloy. You'll be amazed what accumulates under the melt after the surface looks mirror clean. I ladle pour all my ingots because of that. A shallower pot is easier to ladle from. The size of my pot is about the same size as the ring/support for the fryer. I use a reclaimed hot water heater sheet metal jacket for a wind screen and the top for a lid for the whole setup. The jacket is cut to the same height as the pot on top of the cooker. I'm miserly with the gas. Takes me 40 minutes to get the lead up to liquidius. I can get 2500 lbs of alloy processed on a single 20lb propane tank. Each lb of processed alloy costs me 2 cents of gas.
Everybody has their own ideas about what works and doesn't. I use 55 gallon drums to store alloy.