Regarding a point someone mentioned last night when I was struggling (he thought I'd upgraded badly when I hadn't and thought it may have been a contributory factor to my overheating issues).
What is a good setup for a Cobra (trade wise) when I get one?
Word of warning for rookies buying and outfitting Cobra Mk IIIs:-
The easiest mistake for you to make is not watching the potential effects of an upgrade before buying it, in particular the FSD.
So many people have "upgraded" their FSD and not realised that their jump range has plummeted to single figures.
These ships need BIG components. Your new FSD must be a Class 4.