I will buy a laptop soon
That should have been
www.amazon.com.
Obviously, the prices may not be too relevant, since they'll be in $$$, not Euros, but you can make the conversion. (I don't know whether less expensive in the US is also less expensive in Europe.)
Another thing to consider, aside from the all-important point of what your computer needs are, is size/weight. Bigger has the advantage of a more readable screen, and maybe a more standard-size keyboard, but if you're going to be lugging it around, you don't want a behemoth-with-a-handle.
With laptops there will inevitably be compromises, so make a list of what you NEED and another of what you would LIKE. Then decide.