I purchased, imported & recently registered my 91 manual (grade 4B with 100k kms) under the new laws (NSW). Happy to help answer any questions you may have. Imported many cars over the years too. My NSX hunt began in late 2017 actually.
Can say that you'll need to bump your budget a bit though if you want a manual. I've been watching the auctions for a long time & bid on approx 12 NSX's before getting mine.
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Happy to put you in contact with numerous brokers, but overall I find it's most important to ensure you have someone on the ground inspecting each car before you bid. I put together a bit of a list of items to check & report back on before bidding. Also be clear about pricing & fee structures. FOB costs vary from fixed fees, to percentage based on the value of the car. Depends on your importer, so just make sure you're clear on that before you partner up.
When it comes to bidding, it's quite exciting & honestly pretty up & down. Some cars have been circling auction for a while with a decent reserve, whilst some will sell first attempt so you'll need to be on the ball to pounce. I generally recommend to be a bit aggressive & not too conservative when you find the example that "talks to you". Just because one sold for 5.5M yen the prior week, doesn't mean you'll score it for that.
Decide for yourself on your budget, what you're generally after & what your plans are. If you want a low mileage collector car, then you'll pay top dollar & honestly want to keep it as is with relatively low usage to preserve the value. If you plan on driving it daily & doing some modifications, then your criteria should change to suit & open up your options. Red is obviously most popular, then silver in my experience. Good black manuals are actually very rare.
You'll likely find yourself bidding at USS Tokyo (Thursday) & USS Nagoya (Friday) so keep a reminder in your diary to check the auction feeds the night before so you can prepare inspections on your potential candidate(s). Also familiarize yourself with the auction grading system & how to read the sheets. Judge each car on merit, but be wary that NSX's are not simple to repair given the alloy construction, so I'd certainly avoid anything with major repair history (also saves heartache come compliance).
On a sidenote, there are MANY automatic NSX's available. You will inevitably find yourself considering these due to their more attractive purchase price. I will say however, that if you want a manual, just buy a manual. Conversions aren't difficult, but your future value will never equal a genuine manual & the parts for conversion are a bit rare & frankly not cheap. The camshafts on manuals are also different to autos.
HAPPY HUNTING!!