Going to America next week, what should I buy from my spending money? (250$)

Anything but food =P

Depends on where you are and what your hobbies are. America has a lot to offer that is either not available in Europe or cheaper.
For example in bigger cities I would recommend checking out some good stores for Sneaker or Streetwear. Comics are way cheaper in the states so a nice little stack of 'em would be nice as well. Eat a lot of the unhealthy but incredibly tasty fast food they've got.
Whatever your heart desires.
I wouldn't buy something for your PC if I was you. Enjoy yourself.

Buy an experience, not something physical

Parts are generally cheaper than in Europe, but not by much and depending on how much you spend you could be hit by duties.

Then there's also the risk you damage the parts in transit.

Warranties are generally worldwide these days, assuming it's a respectable brand.

Tbh, if I was you I'd buy clothes.

Branded clothing is much cheaper in the States.

Just remember that you generally have to add sales tax onto the marked prices in some independent stores.

Where are you visiting?

If it's NYC, then I recommend Century 21:

http://www.c21stores.com/

http://apps.tsa.dhs.gov/mytsa/cib_results.aspx?search=computer%20parts hope this helps tsa can stil decide to not let it go trough though so wouldnt risk it I would go for Shaq Soda ;p

come here, buy everything cheap, just buy. doesnt matter what.

go home, sell high, make profit. lol

Cheeseburgers, duh.

Don't forget to buy the cheap souviners that were made in China!