LOL. 18 months is an eternity in today's car market. I can't figure out why people order normal cars that take two years to get. Car is old by the time you get it and new stuff is already available and announced elsewhere. It's one thing if you're getting something really special, but it's another if it's a normal production car. 

Wait 18 months for your NSX, or buy one off the lot in 20 months, or buy a used one for under MSRP in 12 months.