My extra pairs of rear wheels turned up today. I have always found it much easier to have multiple sets of wheels with tyres pre fitted than it is to line up and pay the tyre changer. In the s14 a new pair of tyres only lasted 12 laps so it would've been a lot of standing around. I expect to get a lot more life out of the tyres on the Z though.
I ordered 4 of the Work CR Kiwami Ultimate in 19x11 +18. They will most likely have a 20mm spacer behind them as well. With a 265 tyre stretched on.
The color is Glim Silver, it's really nice.