My 1992 model is my second Nissan 300ZX (the first being a 1990) and they are wonderful cars. I'd recommend them to anyone. Their gas mileage is never great, but is never horrible either, especially for the car you are getting. My car is around 12 years old and still looks better than most newer cars.
The t-tops in my first z were so much fun. My new one is a slicktop, which is supposedly lighter and more rigid. I think it might be true:) It has a lot of leg space for both the driver and passenger, and always a lot of power.