PCPartPicker part list:
http://de.pcpartpicker.com/p/n2wtf7
Price breakdown by merchant: http://de.pcpartpicker.com/p/n2wtf7/by_merchant/
CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor (€201.90 @ Caseking)
Motherboard: Asus H97M-E Micro ATX LGA1150 Motherboard (€89.04 @ Amazon Deutschland)
Memory: Kingston HyperX Fury Black 8GB (2 x 4GB) DDR3-1600 Memory (€52.49 @ Amazon Deutschland)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (€53.43 @ Mindfactory)
Video Card: Asus Radeon R9 270X 2GB DirectCU II Video Card (€165.84 @ Mindfactory)
Case: Cooler Master N200 MicroATX Mid Tower Case (€44.35 @ Amazon Deutschland)
Power Supply: XFX TS 550W 80+ Gold Certified ATX Power Supply (€81.79 @ Mindfactory)
Monitor: BenQ GL2250HM 60Hz 21.5" Monitor (€123.99 @ Amazon Deutschland)
Total: €812.83
Prices include shipping, taxes, and discounts when available