Being a previous BMW, Porsche and Ferrari owner, I considered various models of those brands before I decided on the NSX. I went on a search for "my last great sports car". As a long time instructor with the Porsche Club, I had ridden in many types of cars and seriously considered a Porsche 993, BMW M3, BMW Z3 - especially the BMW Z3 M Coupe (rare). The NSX is a driver's car.
Basically the BMWs are sport sedans even the Z3 or Z4 M versions- they are heavy and not well balanced. And for a driver, especially someone who appreciates driving on a track, the major problem for the MZ4 is that they can't get all that horsepower down to the road because they are so light in the rear end - so they have a tremendous amount of power but can't use it without the rear end kicking out dangerously. Not easy to drive fast on the track at all. A newer M3s would be a much better choice for serious driving. As for a "type 911" Porsche, don't get anything newer than a 993 - they are for drivers.
The NSX is older but an ingenious design and a wonderful handling car. The engineers started with a blank page and asked: "what would be the best design and material for everything" i.e. engine location, suspension, drive train, body. Thus the NSX has titanium connecting rods, V-TEC, aluminum suspension, aluminum body, etc. Think about where the engine is located in a Formula 1 race car and its weight distribution. There are many, very important design reasons for those. Think about what happens to weight distribution under heavy braking? For the NSX, it goes toward 50/50 for great balance and stablitity and preparation for turn-in. For the front engine MZ4, there is excess weight shift to the front, the rear is too light and unstable under heavy braking and, as the MZ4 transitions to turn-in, the inside rear wheel is very light -----> oversteer. Now try accelerating hard out of the turn. She won't do it! Power-on oversteer and around she goes.
Hang out on this website, read the FAQs and learn about the car. If your goal is a truly unique, 2 passenger car that will please your driving desires for years to come, then spend some time getting to know the NSX. Owners in your area probably meetup from time to time and would be happy to give you a ride and a lot of information. Plus the NSX is VERY dependable, gets great gas mileage unless you are driving in V-TEC and it doesn't cost an arm and a leg for maintainance.