My Uncle and I just started playing with different rims for his 260Z.
The less offset the better with say... 6/7 inch rims (no more than +20/+10 offset). We tried 7-8 inch rims too, but it looks like we'll need spacers and/ or guard flaring for fat tyres. Skinny tyres
might be alright. Around 0 offset would be preferable for an 8 inch rim.
Long story short: He's a 'bolt-on' man... if it doesn't go straight on, he doesn't want it.
Pretty much anything will work if you're willing to massage guards, fit longer wheel studs, and find thick spacers.
Good luck
PS Try organising at a Mag shop a "fitted" price for some rims you like. It's then
their job to make them fit within the budget of the quote they gave you.
Could save you alot of hassle...