What are your oil temps getting up to? You plan on tracking the car, or only for street use? A lot of us that never plan on hitting a track will never need an oil cooler, especially us "lucky" ones that have never seen 230+ temps.
As far as "best" synthetic oil, that'll be debateable until the end of time. Pick a brand of oil, check it reguarly and keep it topped off. Use a company like Blackstone for an oil analysis after your oil change and they'll tell you how the oil (and engine) is performing.
Nissan "recommends" its own brand Ester Oil in the manual, however that is not required.
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"Any man who can drive a 370z while kissing a pretty girl is simply not giving the Z the attention it deserves." Albert Einstein....modified.
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