I've bought my NSX four years ago from a Honda dealer. I knew the former owner and his driving style (no track). The big service and timing-belt were done with the deal, trunk-struts too. After a test-drive I felt the clutch shuddering too much for me. I've asked the dealer what the costs of a new clutch would be regarding that the engine is taken out for timing-belt anyway. He said $400. Great deal!
Within four years and 20000 miles I never had a problem more than $200. BOSE, cooling box leaking. The only thing I was really surprised was tire-wear.
But I was positively surprised by the mpg and the great reliability and performance.
The only problems above $200 were my strong urge to perfect my baby with tuning-parts like wheels, shorties/final, suspension, header for more than $10'000. But every $ made me even happier.
I've sold my two-years-old Integra to the dealer and thought I might regret it changing it for a 11 year old car.
A friend of mine's NSX was on the track and ran into all of the stated $$$-problems.
So make sure you read nsxprime.com.
, test-drive it and have a look at the service history with the mayor points. AND: Never believe what the seller says.
It's that simple.