So to be clear, you don't need any peripherals, just the tower itself? Okay. What resolution do you intend on playing at?
2k euros is quite a hefy PC. You'd definitely be getting a BEEFY rig with 2k Euros. What's your definitive budget? 2k Euros is equal to 2.2k US dollars, which is a lot of money.
If that's truly your budget and you're looking to get the most out of your money, take a look at this. This will beast mode any game on Ultra probably at 1440 resolution, and get most games on 4k resolution. Take your pic on a 1 or 2 TB HDD, but everything else will do you good.
http://pcpartpicker.com/p/xN4pnQ