Looking for advice on my new PC build

This is a decent balanced Intel system using German Euro prices.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor (€346.20 @ Mindfactory)
CPU Cooler: RAIJINTEK THEMIS 65.7 CFM Sleeve Bearing CPU Cooler (€32.29 @ Mindfactory)
Motherboard: ASRock Z97 PRO4 ATX LGA1150 Motherboard (€110.68 @ Mindfactory)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (€46.91 @ Amazon Deutschland)
Storage: Sandisk Ultra II 240GB 2.5" Solid State Drive (€79.89 @ Amazon Deutschland)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (€49.99 @ Amazon Deutschland)
Video Card: Gigabyte GeForce GTX 960 4GB Video Card (€215.96 @ Mindfactory)
Case: Cooler Master N300 ATX Mid Tower Case (€46.59 @ Amazon Deutschland)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (€69.90 @ Caseking)
Optical Drive: Samsung SH-118CB/BEBE DVD/CD Drive (€15.45 @ Amazon Deutschland)
Total: €1013.86
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-12-09 11:13 CET+0100

It has a good PSU, I don't know enough about the unit you selected to recommend it, and the case is cheaper. although cases are a personal choice, 10% of your budget on a case is too much, especially in a budget limited build. You have chosen an unlocked CPU, so you need the parts to overclock it.

If this is a gaming system, overclocking is of very limited value, and generally not worth the cost with Intel CPUs. 1 x 8 memory is slower than 2 x4 and saves very little.

This gives most of the advantages of the i7, four powerful cores and hyperthreading, at the cost of slower CPU and clocked multiplier, but is idnificantly cheaper.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Xeon E3-1231 V3 3.4GHz Quad-Core Processor (€267.84 @ Mindfactory)
Motherboard: ASRock H97 PRO4 ATX LGA1150 Motherboard (€93.62 @ Mindfactory)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (€46.91 @ Amazon Deutschland)
Storage: Sandisk Ultra II 240GB 2.5" Solid State Drive (€79.89 @ Amazon Deutschland)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (€49.99 @ Amazon Deutschland)
Video Card: Gigabyte GeForce GTX 960 4GB Video Card (€215.96 @ Mindfactory)
Case: Cooler Master N300 ATX Mid Tower Case (€46.59 @ Amazon Deutschland)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (€69.90 @ Caseking)
Optical Drive: Samsung SH-118CB/BEBE DVD/CD Drive (€15.45 @ Amazon Deutschland)
Total: €886.15
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-12-09 11:20 CET+0100

Dropping to a powerful four core CPU give this.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor (€191.94 @ Mindfactory)
Motherboard: ASRock H97 PRO4 ATX LGA1150 Motherboard (€93.62 @ Mindfactory)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (€46.91 @ Amazon Deutschland)
Storage: Sandisk Ultra II 240GB 2.5" Solid State Drive (€79.89 @ Amazon Deutschland)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (€49.99 @ Amazon Deutschland)
Video Card: Gigabyte GeForce GTX 960 4GB Video Card (€215.96 @ Mindfactory)
Case: Cooler Master N300 ATX Mid Tower Case (€46.59 @ Amazon Deutschland)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (€69.90 @ Caseking)
Optical Drive: Samsung SH-118CB/BEBE DVD/CD Drive (€15.45 @ Amazon Deutschland)
Total: €810.25
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-12-09 11:22 CET+0100

The i5 is the 'standard' Intel gaming CPU at the moment.

Configured as an AMD system.

PCPartPicker part list / Price breakdown by merchant

CPU: AMD FX-8320 3.5GHz 8-Core Processor (€139.90 @ Caseking)
CPU Cooler: RAIJINTEK PALLAS 56.5 CFM Sleeve Bearing CPU Cooler (€48.76 @ Mindfactory)
Motherboard: Gigabyte GA-970A-UD3P ATX AM3+ Motherboard (€86.38 @ Mindfactory)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (€46.91 @ Amazon Deutschland)
Storage: Sandisk Ultra II 240GB 2.5" Solid State Drive (€79.89 @ Amazon Deutschland)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (€49.99 @ Amazon Deutschland)
Video Card: Gigabyte GeForce GTX 960 4GB Video Card (€215.96 @ Mindfactory)
Case: Cooler Master N300 ATX Mid Tower Case (€46.59 @ Amazon Deutschland)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (€69.90 @ Caseking)
Optical Drive: Samsung SH-118CB/BEBE DVD/CD Drive (€15.45 @ Amazon Deutschland)
Total: €799.73
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-12-09 11:24 CET+0100

You almost must overclock an AMD CPU for great gaming performance. The 8320 is the same silicon as the 8350 and is likely to reach similar speeds for less money. The motherboard I have chosen is the cheapest available that it robust enough to overclock a 125W four module AMD CPU on, as far as I am concerned. I would not use anything cheaper.