I'm going with the Seasonic S12II-Bronze 430W since that one is in the good section and it's just €57,80.
CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor New for €178,80 ($203,35)
Motherboard: ASRock B85M-DGS Micro ATX LGA1150 Motherboard New for €54,35 ($61,81)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory I already own
Storage: Western Digital Caviar Green 1.5TB 3.5" 5400RPM Internal Hard Drive I already own
Video Card: Club 3D Radeon R9 280X 3GB royalKing Video Card Used for €146 ($166,05)
Case: Cooler Master N300 ATX Mid Tower Case New for €45,90 ($52,20)
Power Supply: Seasonic S12II-Bronze 430W New for €57,80 ($65,74)
Total: €482,85 ($549,15)
Thanks for your help!