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What do you want and its 1200 euros that you want to spend for it ?
double monitors inst that necessary youre games will only use one so .
more diskspace, more ram, better graphics card or dual...

PC`s can only build in one way all is made so it will fit in one way and one way only.
Although you might want to watch youre processor when you plug it in.

Most graphics cards have HDMI and DVI outputs so dual screens isnt a problem

What about this setup ?

http://pcpartpicker.com/p/1OGWB

The only thing you might want to get different in this setup is the motherboard you might want to get a asus or msi motherboard instead...

What would be youre price range and what are you going to do with youre new pc ?