I do not currently own an NSX, but I am going to give you my feedback anyway since I am looking for the one that I want as well.
It took me 8 years to find the Supra that I wanted, yes 8 years. I couldn't find the year and color combo I wanted with low miles for that long. I took a trip 2,000 mile trip across the country to buy the car. So when you say you are looking to buy am NSX this weekend, it kinda seems like you're in too much of a rush.
When purchasing a vehicle that happens to be one of your dream cars don't rush it. It pays to know what you are looking at, looking for, and watch the used prices as compared to years and models to know what you can expect to pay for a certain combo.
I have been looking for an 05 black / black with low miles since I joined this forum 3 years ago, finally one is for sale and I'm away on business ready to lose my mind because it's probably going to sell before I get back. The person has it listed for 65,000 and although most people would consider that on the high side, it has 8,xxx miles on it and is basically brand new. That's a hell of a good deal if you ask me.
Price means nothing other than how much car you can afford. Spend more to get the history on the car, and a 1 owner vehicle if possible so you are more likely to get the truth.
To answer your question, ask the seller what their bottom line price is. If they say their price is firm, either buy it or keep looking - any big purchase is worth the wait to get exactly what you are looking for.