NSXs are extremely well built and reliable cars, but all cars age, and things like seals, rubber, gaskets etc all wear with age no matter how well they are cared for.
I like the car you're looking at, but would consider the price of an engine rebuild into the equation as well as changing hoses etc. It won't need all of that right away, but will down the road, and if you're prepared for that, then you've made an educated purchase.
You could also look at white NSXs and cost out the mods yourself.
Good luck! Come to XPO in Toronto no matter what!