The KW V3 for the NSX is one of the most thoroughly developed suspension options for our cars. Billy Johnson [MENTION=16531]stuntman[/MENTION] spent a lot of time working up this system and for all but the most dedicated motorsports-focused NSX, it is more than enough damper for your needs. KW tuned the system on a real NSX on their 7-post testing rig, so they got the motion ratios and chassis balance right. Then, they went and tested it on the Nurburgring on a NSX. So, from a development perspective, the KW is probably second only to the factory suspension in terms of actual testing on a real NSX for a commercial suspension option. Considering a new NSX-R suspension is $4,000 (plus at least a 6 month wait time from Japan), and the Type-S suspension is potentially not available anymore, it's probably your best bet if you want a no-compromise solution.
That being said, I was involved with BC Racing's development of a suspension on my old 91 NSX. With a 10/8 kg Swift spring combo, that setup was fantastic on the street and very trackable. It is, however, a much lower grade of damper compared to KW. If you are not going to track the car, you should consider it. As I understand it, my old BC setup is still running strong on that car.
Also, you should take a look at the JRZ RS One option. It's a bit more than the KW, but of the same level of quality. The JRZ is more of a motorsports-focused damper, with an aluminum body vs. stainless steel for the KW. Thus, the durability might not be as good. Also, I'm not sure how much development work JRZ put into their consumer NSX damper. While I know that their motorsports program has a huge level of support, those are on bespoke race cars and any settings likely will not translate to a street-driven NSX. The same is true for Moton, MCS, Bilstein and other full race setups.
Thus, if I were you, I'd consider:
KW
JRZ RS One
Type-S (if you can find one in Japan)
BC (If not concerned about racing)