Unless you are cooking for a big crowd, getting a huge propane deep fryer, like one for a turkey, is a waste of oil. If you want a turkey size fryer to deep fry turkey, that is fine, but for just deep frying a few fish, that is a lot of oil, and fishy smelling oil at that, when it is over. I have a turkey fryer, and it is great for turkey, crab boils, clam bakes, etc... For deep frying fish, fries, chicken fingers, etc..., I have a 1 gallon unit from Waring Pro. It is electric, has a decent size well/basket, and a break-away cord for safety. It is a great unit, and costs about $100.
To me, unless I am doing a fish fry with hush puppies, onion rings, fries, etc... for a lot of people, I cannot see wasting all that oil, and money on the oil.