Most of the modern DVD players will play both NTSC & Pal. Ours is 5 years old and plays both, without any problems, so if your player is newer than mine, an NTSC DVD should play for you. The cheaper the price of the player, the more chance you will have that it plays both formats (not sure why, but maybe to do with the country of manufacture and the ability to sell all over the world). It should say on the front of the DVD player what formats can be viewed.
We used to live in the States and a lot of our DVD's are from there, so we researched a lot before we bought one and found that it didn't really matter that much. It was down to personal choice.