Jez I know your going to be VERY cautious this time and have it checked over top down, bottom up.
Will sour you for life on skylines if you get a lemon after the orange.
8k for a 33 should get you a grade 4.5. Buyers market not a sellers.
If you find one make an offer your comfortable with and walkaway. Do not negotiate !
Take someone experienced with you when you check them out.
If you can afford it and NRMA still do it pay for a written report ($300).
If the seller has issues with you doing this then walk away. They know of something they are not telling you.
Old saying Fool me once, shame on you; fool me twice, shame on me