this is what i suggest to you
PCPartPicker part list:
http://de.pcpartpicker.com/list/vzXQd6
Price breakdown by merchant: http://de.pcpartpicker.com/list/vzXQd6/by_merchant/
CPU: Intel Core i5-6600K 3.5GHz Quad-Core Processor (€233.93 @ Mindfactory)
CPU Cooler: Deepcool GAMMAXX 400 74.3 CFM CPU Cooler (€30.09 @ Amazon Deutschland)
Motherboard: Asus Z170 PRO GAMING/AURA ATX LGA1151 Motherboard
Memory: Kingston HyperX Fury Black 8GB (1 x 8GB) DDR4-2133 Memory (€44.14 @ Amazon Deutschland)
Storage: Samsung 120GB 2.5" Solid State Drive (€54.90 @ Amazon Deutschland)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (€53.90 @ Mindfactory)
Video Card: Asus GeForce GTX 1070 8GB Video Card
Case: Corsair Carbide Clear 600C ATX Full Tower Case (€134.90 @ Amazon Deutschland)
Power Supply: Corsair RMx 650W 80+ Gold Certified Fully-Modular ATX Power Supply
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer
Operating System: Microsoft Windows 10 Home OEM 64-bit
Total: €551.86
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-10-01 20:04 CEST+0200
i do not know if you bought the gpu / psu / motherboard already?