My CS pan loves the Iwatani 35FW

Definitely recommend this (though I think you meant butane). I recommend springing for a nicer one that will last you. Picked this one up and have been very happy with it. Butane canisters are relatively inexpensive and you get a solid amount of juice out of each.

Ends up being nice having an extra burner around too if you end up with a full stove and need to suddenly boil a pot of water of fry up a pan of bacon.