Thanks for elaborating.
After the recent events I updated my proposed build (see opening post as well)
Mainboard: Gigabyte Ga-H77M-D3H Socket 1155 (stays the same)
CPU: Intel Core i5-3470 Box Socket 1155 CPU (4x 3.2 GHz) (stays the same and I will overclock it. I have to learn how, though)
GPU: AMD R9 Fury (upgrade!) 428.93 €
RAM: DDR3RAM 4x 4 GB DDR3-1600 Kingston HyperX (upgrade!) 34.01 €
HDD: Barracuda 7200.14 2 TB (upgrade!) 67.06 €
SSD: MyDigitalSSD 240GB (256GB) BP5e Slim 7 Series 7mm 2.5" SATA III (6G) SSD (upgrade!) 53.19 € (59.99$)
Power: 1000 Watt be quiet! Power Zone Modular 80+ Bronze (upgrade!) 158.81 €
(Case: Sharkoon Vaya MidiTower
Fan: ARCTIC Freezer 7 Pro Rev. 2 CPU Cooler
OS: Windows 10) (upgrade :/ )
742.00 € in total