For the price of the Nav package, you could get a good aftermarket HU which would deliver a whole lot more features.
I don't believe redline is different on any of the models. They all peak at 7500. I believe the difference that you are referring to is where the HP peaks.
I you're planning on doing a lot of mods, it would be kind of couterproductive to buy the Nismo. It has a little more HP and a slightly tighter suspension, but if you're going to drop it and basically change the suspension, get a cheaper model and spend your money on mods.
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