Where are you going to buy the car??? That makes a big difference. If you bring the car over and it's already in your name with title, they should NOT charge you sales tax since you already bought it. You will have to pay registration etc.
If you are buying the car in the US and want to register it in NY, you will have to pay sales tax as well as the registration etc. Even if you buy the car out of state (but in the US), you will have to pay the NY state sales tax.
2009 Lotus Elise White
2008 Nissan Titan--2002 MBZ S430
2008 Aprilia Tuono--2010 Harley Road King
2008 Aprilia RXV 550/KX 250
Tons of mountain bikes