Many people appreciate the NSX for what it does the way that the engineers designed it at the factory. Its handling characteristics have been carefully designed to deliver crisp turn-in, slight understeer, and a given degree of tire scrub. Everything in the suspensiuon was carefully considered in the packaging of the NSX right down to the rim and tire size (small front wheels for less footspace intrusion, smaller frontal mass to deliver a Cd of .32, and to give that slight understeer). Remember that Honda even had Yokohama design and build tires specifically for each corner of the car according to Honda's needs and specifications.
Many people change and manipulate the wheels, tires, springs, shocks, etc. in order to get the car set up for the way they intend to use it. I too, as you may know, have changed a few of my car's settings. But what you may want to do is first experience the car the way it is delivered from the factory, if it is still in that form, before you try to second guess the engineers from Honda. I don't know you GBM, but I'm willing to guess that the NSX designers have a little more experience than you in this field. I still track my car with OEM wheels and Yok's just to experience the street set-up at 9/10ths performance. I am still not at the limit of this set-up in my driving ability, and I'm not a bad driver.
Good luck to you with your new NSX! And happy driving.