You need to have a realistic goal for what modifications you will be running and how much power you will be producing. There is no one size fits all exhaust. For mild setups a power log and downpipe is plenty, but if you are looking for 11 second times you will need headers, and then if you are in header land you will need to decide the ideal primary tube size which will again depend on the engine setup.
As far as ceramic coatings, I am leery of them. Even well known places like Jet Hot have quality issues at times and if the ceramic starts flaking, you just wasted your money. Only get it if you know the coating is done by a reputable place.