Even you are working full time, think you can afford monthly payment is the dumpest idea. That's why you see so many people driving M3 because they think they can afford a $700 payment monthly. Such materialism is so wrong for this age. The reality is you can't afford the item if you can only make monthly payment on it.
Three things to do for your age: learn how to save money, learn how to make money, and learn how to control your desire. Once you finished that, you are probably in the age of looking for a van.
Setting up a real life goal and a financial plan (saving and spending) for yourself is very important for your life. Never get a loan on a car especially on the NSX. Learn to put these money on something more valuable. The best way is to invest yourself: learn more skills, develop your career path, and travel around to open your vision etc. Most NSX owners use disposal income to play with their car. Like other said, nsx costs way more than you can think of even you think you can do it yourself (dude, the parts cost $$). Even you have the money, you should help out your family's monthly spending. How about you pay for the gas electric bill?
I suggest you to keep the S2K, make sure you keep up with the maintenance, and you should have lots of fun with it. Relax and take a further look of your life. When the time comes, you will get yours. Be patient!