To be honest with you Bob, I would not bother with cast iron stuff. I have tried/used them all in my time and to be honest the only cast iron I use now is for oven cooking. The Khadai or Kharai is used by Indian cooks for cooking on an open fire and for deep fat frying, mostly the latter in UK. I use an Indian frying pan or skillet for most flash frying, I use three sizes of good quality Woks for most other things; the best are the spun steel ones used by the Chinese cooks (you have to season these first).
Now for pots, i.e. fo cooking large amounts and for bases etc., it is well worth buying ones made from good quality stainless steel with a sandwich layer (aluminium) and heavyweight base for the even spread of heat. It is hot spots that wreck cooking in most cases. I use several different sizes but a good quality 26 pint stock pot is a good all rounder; these will cost around ?100+ UK pounds. I use top quality American non-stick pots for the rest of the jobs, you can buy these 'Professional Cookware' pans for about ?100 for any 5 pans of your own choice from the range
www.cookware.co.uk.
I have huge (24") heavy gauge aluminium Kharai ( about ?15 for Southall) that I use for large volume deep fat frying, and a simple domestic Kenwood Pro 4 litre rectangular deep fat fryer (about ?29).
Thats about it. However, As the guys & gals here will tell you, you can get away with simple domestic products, but do buy a decent wok and frying pan. I would not pay a lot and I certainly would not use non-stick as the coating will break up with the heat & acid combination. I would also advise against using aluminium products except for deep frying, aluminium reacts badly with certain chemicals (spices and acids) and is known to be a cause of Alzheimer's.
Happy Cooking
CP
I realise that you are in the US, but I am sure you will get this stuff there