If they really use a special plug (like for the Alpine CD charger back in the days) you could buy an ordinary CTEK-charger and solder its plug instead of the 'special' one (saving $200 at an expense of $xxxxxx, maybe not realistic

).
The reason why I ask is because some NSXs will get driven quite seldom and as the NSX is a hybrid car the hybrid battery needs some Attention if you don't drive it daily. In all hybrids it's stated in their manual that you should run the engine for around 30 minutes every month or so to keep the battery happy. Honda has a long time experience with hybrids but mainly with Ni-Cd batteries and I thought they addressed the potential problems with a hybrid battery charger. So I thought THIS is the option a buyer can/should choose.