I have gone with 9.5 x 18 ET35 TC105N as track-day wheels, with 12.7mm spacer for front and 25.4mm spacer for the rear (I have ARP extended studs so my spacers are machined to be hub-cenrtic on the Nissan hub and to fit the 75mm bore on the TC105N)
I run either 275/35R18 or 265/35R18 tyres for a square setup ... the 265 are Dunlops DZ03G which have tread width of 275mm anyway and static radius of only 305mm mm(dynamic radius of 315) so I get a lower CoG without compromising suspension arm angles, and the gearing is equivalent to 3.9 gears.
The 275 are variously NT01 and R888 and I have also tried a set of A050 Yoki's in 265 as well.
I've come to the conclusion that in the absence of a big uplift in torque, a square setup on the "fat" 265 is perhaps the sweetest handling/grip option, but that is personal.
I'm not so much into aesthetics, but more about mechanical grip and laptimes ...
The R888 in 275 have a similar dynamic radius to the Dunlops, so the price I can purchase at is usually the determining factor.
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