I am using a 4.2 cubic foot Danby designer series fridge. It holds two Cornies, a 5 lb tank and regulator. I like it because there is no mods needed except the door. Thre is no freezer to contend with. The door shelving unit comes out easily and I put in a sheet of plastic from a signmaking company - cut to size. It does not hold as consistent a temp as some of the other fridges but there are plenty of threads here to show how to correct this- I have not nothered yet as I have not encountered serious problems. I have not installed a tower yet (still using cobra taps) but again there is plenty of info available as to how to do this