I made catfish tonight, with "fish and chips" batter after the smoked paprika rub. Never done it before, and should've know that catfish would take longer than the stated 5 minutes to finish cooking (had to finish it off in the oven). A lighter fish next time, but it was still pretty good... still learning! Served with pre-made polenta in the toaster oven, and plenty of hot sauce.
Geoffy,
Codfish is your best best for fish and chips. It's firm and fleshy, but light so it cooks quick and evenly. It's also widely available and usually reasonably priced. Check it out and let me know.
"I got news for you. If it wasn't for the toilet, there would be no books." --- George Costanza.
Served with pre-made polenta in the toaster oven, and plenty of hot sauce. 
