I agree with mikec regarding the payment question. However...
If I were buying a car long distance, I wouldn't fly somewhere just to evaluate it. Instead, I would first have someone local to the car evaluate it - either a pre-purchase inspection by a dealer/mechanic who does a lot of NSX service, or an inspection by a knowledgeable local NSX owner, and preferably both. (And you can get recommendations here on NSXprime of those in the area qualified to perform such inspections.) If I am satisfied with their evaluation of the car, I would agree to buy the car, contingent on its being in the same condition when I pick it up, and would send a deposit at that time. I would fly out only to actually complete the purchase, present a cashiers check for the balance due, pick up the title along with the car, and drive it home.
The reason I would do it this way is that I would avoid spending hundreds of dollars on travel expenses and lots of my own time to inspect a car that might or might not be as described. Furthermore, unless you already have a lot of experience evaluating NSXs for cosmetic appeal as well as technical soundness, the "experts" in the area who could do the inspection are probably much more qualified than you might be. In other words, I'd rather pay for a couple of hours of a mechanic's time, than to spend a lot more money than that on airfare and a lot more of my own time.
Just a suggestion to think about...