AEM are pretty premium, they make parts for Nismo for example.
Cheap tyres is something to get used to if you're buying from a dealer, very very few of them are going to fit £800 worth of tyres when they can fit them for £300 and be legal unfortunately.
High clutch pedal seems to be a Zed trait, I don't know about the 300ZX and before that, but the 350 is exactly the same, you get used to it or adjust it.
Visibility is awful in all Zeds, small price to pay for a sexy body shape