Now would be a good time to keep your eyes open for someone selling a set of the stock 18" wheels. You can often find them as people upgrade their wheels from the base edition. The stock 18" wheels fit over the sport brakes.
Reason: snow wheels! 18" Blizzaks will make your winter a whole lot more reasonable. 18" snows are a better bet in the winter too. Plus the stock 18" wheels will likely have the senders in place already for the tire pressure warning system. I bought a set of stock 18's two years ago and had them fitted with Blizzaks. My total outlay including wheels & mounting/balancing was about $1500. I've been through a couple of hard winters without much drama (Connecticut), altho I don't put many miles on the Z in the winter.
One nice thing about the sport model is the viscous limited slip differential, which is a real boon in snowy conditions.
Also, I wouldn't worry too much about oil temps, unless you are tracking your car. As soon as you start adding performance (intake, catback, high-flow cats, tune), then you'll probably want the oil cooler. When you do, get one with a thermal plate that closes off the oil cooler at lower temps. Otherwise things will run too cool in the winter, and your gas mileage will suck.
Hope this helps.
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