I think I´m gonna go with the r9 290 since it is on a sale right now.
Updated list:
PCPartPicker part list:
http://de.pcpartpicker.com/p/8kkQLk
Price breakdown by merchant: http://de.pcpartpicker.com/p/8kkQLk/by_merchant/
CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor (€160.33 @ Home of Hardware DE)
Motherboard: ASRock H97M Micro ATX LGA1150 Motherboard (€75.89 @ Home of Hardware DE)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory (€80.46 @ Home of Hardware DE)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (€54.90 @ Amazon Deutschland)
Video Card: Sapphire Radeon R9 290 4GB Tri-X Video Card (€299.73 @ Amazon Deutschland)
Case: NZXT Source 220 ATX Mid Tower Case
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (€58.25 @ Hardwareversand)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer
Total: €729.56
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-10-24 18:25 CEST+0200