I just went through this process. Most paint shops will RUN away from the NSX not because it is hard to paint, but because they are afraid of taking it apart. The shops know the car is old and thus they know they will break stuff when they take it apart- especially if they have never handled a NSX before (most have not). They will have to pay for new pieces and they know it will be very expensive. Most of your cost on a full paint refresh is disassembly of the car. So, they usually quote you an outrageous price to chase you away. I'm working with a good shop who explained this to me. For my car, which is getting a full color change, they quoted between $4,000 and $6,000 to prep, primer, sand and paint, depending on how much of the prep I do myself. I am doing all of the disassembly myself, which is saving about $4,000. I'm also doing a lot of the masking and taping myself, further saving cost. Also, I asked for a "factory" level paint job. This means just like Honda did it- wet sand the color and then shoot the clear. If you want a concours/museum piece job (wet sand every stage, multiple color and clear layers), the cost will go up because the labor time goes up. Also, cost depends on market. A paint job in NYC will cost a lot more than in Wyoming.
With all that said, in your case you don't have to go as far as me in taking the car apart- you're really just re-painting the main body panels, not the chassis. Thus, I think a realistic range for a shop to do all of the work is $7,000 to $10,000. If you have a pearl paint, they will need to paint the panels on the car to make sure the pearl is all uniform. If you have a solid color, they can paint the panels off of the car. Another piece of advice is to propose doing the job during the shop's slow season. Here in Denver, most body shops are extremely busy during the spring/summer because of the crazy hail we get in Colorado. My shop said they would be a lot more willing to do the work in December, when things are slow. They actually relaxed a lot and became more enthusiastic when I said December was fine (though not as enthusiastic as when I said I would take the car apart myself lol). Finally, you may want to contact Prime member [MENTION=4046]pbassjo[/MENTION]. Joe has painted more NSXs than probably anyone else in the US. I'm actually giving my shop his contact info for pointers/tips. Joe may be able to steer you better.
Hope this helps.