At best try it soon. Nowadays the US-$ is so weak, that travelling to the US is not too expensive for us Europeans. And when you go shopping in NY, you can save more money.
Aren't there some low-cost-airlines in Madrid, too?


It's just my tip, because in my opinion travelling around the world is an a more fascinating hobby than cars. A car you can forget in a garage for weeks or months, and you can spend money for your dream-car also, when you are older - but the experiences and adventures, you have made by travelling around, noone can ever take away.