Between my wife and I, we've now owned all 4 generations of Miata. Over the years, we've owned quite a few Miata's:
-1990 NA6
-2004 Mazdaspeed NB
-1992 NA6
-2018 ND1
-1994 NA8
-2009 NC2
Out of all of them, the NC is my favorite. In some circles I might be burned at the stake for speaking such blasphemy.
To give some context, I'm 6'2", 210 lbs. The NC has by far the most space for my frame, which certainly plays into this equation. The NC has nearly the same amount of space as my S2000, despite being 300+ lbs lighter than my AP2! In order of which one do I fit it:
1. NC. It's not even close, both in the headroom and legroom departments (although I do occasionally get jabbed by the door handle/cup holder in my left leg).
2. NA. The NA's simple interior offers me the 2nd most space; especially after a mild foamectomy and door pull straps.
3. ND. The ND isn't terrible, but my NA's felt far more spacious/less cramped inside. The ND was by far the hardest to get in and out of with the top up and felt the most claustrophobic, both due to the intruding door trim and windshield that sits close to my face. Once inside, the legroom was pretty good; the headroom was tight with the top up. Not sure if it matters, but we had the Club trim with the Recaro seats.
4. NB. For whatever reason, the NB was always the tightest fit for me. I had a hard time getting comfortable in that car. Not sure if an NB1 would have been better, but the NB2 was a tight fit.
Car prices are incredibly high right now, but prior to this madness, with the prices on NC's getting so low, I haven't understood why the NC wasn't the track junkie machine that the NA/NB have turned into. On equal rubber, the NC is substantially faster than the NA/NB in any contest I can think of. The torsional rigidity/chassis stiffness of the NC is more than double what the original NA was.... it's so much more solid and direct vs the NA/NB. The chassis feels like it could take considerably more power without falling apart.
I hear the arguments of the NC being a "boat" and I guess I just don't understand them. According the Mazda, the Miata has had the following curb weights:
1990- 2116 lbs (base, completely stripped out car)
-Package A (power steering, etc) 2182 lbs
-Package B (cruise, power Windows) 2189 lbs
-A/C was optional (added weight)- about 40 lbs
-ABS was
Actual weight when you added in power steering and A/C was likely closer to the 2220 lbs range. That was with either 5.5" or 6" wide wheels.
In 1992 Mazda updated their curb weight (unknown trim) to 2216 lbs.
In 1994 Mazda updated the curb weight (unknown trim) to 2293 lbs. That was with the addition of the 1.8L engine, updated safety/airbag requirements, the bigger rear differential and a bit of chassis bracing to help it feel like less of a limp noodle.
With the intorduction of the NB in 1999 Mazda rated the car at 2299 lbs.
In 2003, Mazda added wider 6.5" wheels, sport brakes, additional chassis bracing, (VVT engine was added in 2001), etc. The result was that the 5MT weighed 2443 lbs and the 6MT weighed 2454 lbs. It remained roughly the same through 2005.
When the NC1 debuted in 2006, the stripped out Club spec weighed only 2441 lbs. It was literally rated at weighing less than the NB2 it replaced... if you added in A/C or stepped it up to the Touring trim, it weighed 2474 lbs. The 6MT with 17" wheels weighed 2498 lbs. Weights for the updated NC2 in 2009 went up a whopping 6 lbs on average.
Essentially, the NC and NB2 were almost identical in weight... despite the NC being a far stiffer, more capable chassis. The NC came with a substantial power bump, heavy use of aluminum (aluminum front control arms, rear hubs and chassis bracing), wider wheels, strong brakes, standard ABS (optional on NB), a more comfortable interior, bigger fender wells and it still came with hydraulic power steering.
At only 2332 lbs, the ND is the most capable Miata ever made. No doubt. Prices certainly reflect as much. Although I do wish it retained hydraulic power steering (the EPS box is muted compared to the NA/NB/NC)... as someone who has crawled underneath all 4 generations of Miata, I know a lot of people say it's a more modern NA; to which I would disagree. I would say it's a smaller NC, as it has more in common with the NC- double wishbone front with multi-link rear suspension (like NC, the NA/NB had double A-arms front and rear), aluminum control arms, aluminum chassis bracing, aluminum 2.0L engine, 17" wheels, etc. To me, the ND is like a 3" shorter NC. Ignoring the EPS, the ND feels more like the NC than it does the NA to me. Just a good bit smaller inside, which is my biggest complaint, followed by the lack of steering feel.
On face value, the original stripped out 1990 NA looks like an absolute featherweight compared to the NC... but when you add in power steering (standard on the NC, and helpful with wide, sticky track wheels/tires), more grip through wider wheels/tires, mandatory modern safety items (airbags, etc on the NB), bigger brakes to aid in track work (like the 2003+ brakes on the NB), chassis bracing to help the chassis feel more stable and a bigger rear differential (added in 1994, drastically improving the rear end reliability, especially on track) you end up with an NB that weighs just about the same as the "boaty" NC.
With that in mind, I never understood many of the track guys that complained about the NC's weight, all while adding bigger NA8/NB rear diffs into their NA6's... frame rails, butterfly braces, frog arms, etc to add chassis rigidity... bigger brakes for track work... and bigger, wider wheels for more grip... at that point, after owning all 4 generations of Miata, the NC just seems like a better place to start. Well, it would be if it had the insane aftermarket of the NA/NB, which is substantially bigger than the NC's.
While the NC is certainly no Lotus Elise, at 2400-2500 lbs, it's over 200 lbs lighter than the BRZ/FR-S/86 and 300 lbs lighter than the S2000. Neither of which are considered heavy for modern day cars.
If prices of an NC are double what they are for the NA/NB, I totally understand saving the cash and getting the NA/NB. If prices start to become close to each other (like they were a year ago), there's no doubt in my mind, I would get the NC. It's faster, it's more comfortable for bigger guys, it's easier to live with and it's actually more fun to drive on a back road to someone like me; not because of the extra speed, but because of the confidence the more solid chassis gives you.
These are all just opinions from an idiot with too much time on his hands. YMMV.