Put a lot of money into the graphics card,
Here is what i would go with if i were to do a full build for 1000 euros. It's just over $1400 Canadian right now
ASUS SABERTOOTH Z97 MARK2 LGA 1150 Intel $
189.99
Intel Core i5-4690K Devil's Canyon Quad-Core 3.5GHz LGA 1150 $
269.99
G.SKILL Ripjaws X Series 16GB (2 x 8GB) DDR3 1600 $
159.99
WD BLACK SERIES 2TB $
169.99
EVGA SuperClocked GeForce GTX 760 2GB 256-bit GDDR5 $
377.27
SeaSonic 750W ATX12V SLI Ready 80 PLUS GOLD $
154.99
TOTAL: $1322.22/ $1415 CANADIAN
and that leaves almost $100 or 70ish euros for a case!
NOTE: This does not include the OS. Prices pulled from Newegg.ca
I did not include an optical drive because all you would need it for is to install the OS. I just used a friends when I built my PC as my tower does not support 5.25" drive bays. Most games are downloaded nowadays.
A 2TB HDD should handle about 300 games. I have 2TB as well in my computer and I have filled 3/4 of it. i have around 225 Steam games, 3 blizzard games, and about 8 origin games. Expand when you need to. I included a 750w power supply so if you do want to go with 2 graphics cards down the road, your power supply should handle it.
If you are looking to the future, that gets pretty expensive if you you are not careful.