Here a quick selection (maybe not complete and certainly not checked for comp ability):
Intel® BX80646I74771 i7 4771 € 299,-
GIGABYTE GA-Z87-D3HP € 129,90
G.Skill 16 GB DDR3-1600 Kit
F3-1600C9D-16GXM, RipjawsX, XMP € 134,90
be quiet! Straight PowerE9 400W € 74,90
Samsung 840 EVO MZ-7TE250BW, 250 GB SSD € 169,90
Seagate Desktop HDD, 3 TB
SATA 600, ST3000DM001, 2x €229,80
Fractal Design Define R4 € 99,90
Cooler Master Hyper212 Evo € 34,99
total without windows : € 1.173,29
You could start with one HDD.
I would definitely prefer a faster CPU first, C1 is currently not using the full GPU potential.
Adding a graphics card is easy afterwards, changing a CPU is a lot more work (and money).
EDIT: I saw that the mentioned motherboard doesn't had displayport, which I recommend. An alternative could be GIGABYTE GA-Z87MX-D3H (but a µATX board).