AlWakRa

For most NA power, stock suspension is sufficient, I tracked my car on stock suspension for sometime and didn't have any issues putting down my power (boltons and tune), I had only OS LSD, adjustable arms and good rubber.

Nismo diff is the same as sport, no difference, I wouldn't say it is bad, but not good as well, getting helical lsd like quaife or wavetrac or clutch type like OS or Cusco is a better choice if you are paying the money.

Nismo shocks vs Coilovers, I will go 100% with coilovers, you get the adjustability for height and compression.

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