We were interested in the 3200GT, because of the boomerang tail lights, but after talking to the Maserati dealership his advice was to stay well clear, "it would cost you 3-5000 pounds in the first year just on repairs!" At least he seemed honest.
Servicing costs, about the same as a BMW (bl**dy expensive we thought then), but he did say the new model was reliable.
As for the NSX, we've had Hondas for years and they have never missed a beat, so as long as it is maintained properly and the engine has not been messed with it should be a sound everyday car. We had a word with our Honda dealer about servicing costs and they said the routine servicings are the same price as accords, same filters and oil, so why charge more just because it has NSX on the rear! The big service with cam belt is a bit more around £800, but thats only every 72000 miles.