where you'll get the advice you need.
We have some forum members who are based in Spain, and I'm sure one of them will post with some good advice about brands. If you think that there's a chance you'll need customer support in Spain I would definitely advise buying the computer there.
For what it's worth, I travel a lot on business - mainly long-haul - and I have never once watched a DVD during a flight. I look upon the use of laptops in aircraft as one of the great anti-social activities, and avoid it if I can. For me a good book is the best companion, and there are always reasonable films on the flights anyway.