I'll sound like an old fuddy duddy here.
Does this car have maintenance records?
It sounds great to have a supercharged NOS machine driving around, burning tires, impressing friends and family, young women etc etc.
However if the previous owner thrashed the car or neglected maintenance you will have spent $29K and may need to spend a lot more to fix the car up.
If you are new to NSX, young, not mechanically inclined it would be best to let this one go.
In the long run you may be better off to buy an NSX with good maintenance records, not too many owners, and obviously looked after.
There will always be some spending when buying a 20+ year old car no matter how well maintained. If you have any major work needing done and need a dealer to do it you can spend $2 - 3K easily just on basic things.
Once you have a year under your belt, learned how to drive a mid-engined car, then you can make modifications galore knowing the base car is sound.
Otherwise we will have another thread on Prime about what lousy car an NSX is etc.