What is the best international warranty/support service for laptops?

I will need to buy a laptop since I will be moving to Europe, Netherlands or the UK depending where I decide to go for my postgraduate studies. I have already seen several laptops, especially about reliability, because I will be two years in another continent, but now I am wondering which manufacturer has the best international service if something goes wrong. For my thesis project I will probably be traveling a lot between the United State, Europe and Latin America, reason for which I need a really good support service worldwide. Thanks for your help.

look for one with accidental damage>myself i would never get one since they cost as much as getting a new computer