Hello, 1st time poster...long time lurker! This is a great site with a wealth of info on the NSX.
I went to Houston last weekend and looked at this car. Have you been able to see the car in person? You may have had a local PRIME member take a look at it for you but just in case, here is what I observed...
The front bumper has been repainted and is peeling. Also, the passenger's door appears to have been hit and repainted. If you look down the car in the sunlight you can see what appears to be warping of the door and there is some over-spray on some of the window surrounds. There was also condensation in the trunk lid (this may be common, not sure). I did not bother them with a test drive but I did start the car and everything seemed fine. The interior looked good (AC blew cold) and the car has 4 very new tires. The left rear wheel has what appears to be a an inch long gouge in it. All the other wheels looked fine. Also, all the panels appeared to have matching serial numbers. The salesperson said they were asking $69000 (they had it on cars.com and autotrader for $67000 which is where I also saw the CARFAX which showed no accidents or problems and the original owner was registered in Georgia if I recall correctly). The salesperson said it came from Oklahoma?
Anyway, I'm not sure what deal you've negotiated but just wanted to give a fellow PRIME member a heads-up on what I saw in my brief visit. Let me finish by saying I am not an expert by any means but after about 2 years of lurking on this board you get to learn a lot! Hope this was helpful!