Where are you going? Will you be living on the economy? How long will you be overseas?
Reason I ask, in some cases in might be cheaper to buy it overseas and to buy an internet and phone package to get a discount for the laptop. Similar to buying a cell phone with a 1 or 2 yr contract in the US.
For example, you can save 400-500 Euros on a decent laptop if you buy a 2 yr internet/phone contract. Laptop prices are a bit higher over here, but with this combo deal, cheaper compared to Best Buy.