NRMA here as i have insured with them for years and they have been good for claims in the past (at fault or not).
amazingly now they don't want a full list of your (legal) modifications but said to get a video of the car etc.
as they have new for old in the first two years i have stuck with that but i am looking at probably a fully detailed policy with TCIS or similiar next time around as it will be two years old.
Never use a market value policy. (unless like mine the first two years are new for old). Market value can hurt you especially if another insurance company writes off your car (i.e. other drivers fault).
mine is a work vehicle in Western Sydney (AKA theives friggin paradise) and i pay almost $1900 per year with a good driving record but two claims in recent years - wife and hail. (AKA hail friggin paradise)
also when using brokers check who they use. i used Farmers Union once with a broker and they were absolutely terrible after our commodore was stolen. they even put second hand tyres on after the recovery (cause the thieves did burnouts) to match the fronts
i couldn't believe it the insurance rep would have spent more money wasting his time looking for the second hand tyes than getting new ones. NRMA in my experience would never use those practices.
in any case you always judge an insurance company by their claims service - not their premiums - taking premiums is the easy part for them.
This car is like a bad drug habit. It is taking all my money and time, my family are concerned, but new mods just feel sooooooo good.