Any thoughts on PC upgrade?

So I've decided to finally upgrade my PC (Mostly the CPU), but i would like to know what you guys think about the upgrade.

Here's my current PC:

PCPartPicker part list: https://de.pcpartpicker.com/list/6WxyxY
Price breakdown by merchant: https://de.pcpartpicker.com/list/6WxyxY/by_merchant/

CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor (€182.79 @ Mindfactory)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (€31.79 @ Amazon Deutschland)
Motherboard: ASRock H97 PRO4 ATX LGA1150 Motherboard (€78.41 @ Mindfactory)
Memory: Kingston HyperX Fury Blue 8GB (2 x 4GB) DDR3-1600 Memory (€71.04 @ Mindfactory)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (€56.06 @ Mindfactory)
Video Card: Sapphire Radeon RX 480 4GB NITRO+ 4G Video Card (€224.99 @ Aquatuning)
Case: Cooler Master MasterBox 5 (White) ATX Mid Tower Case (€66.67 @ Mindfactory)
Power Supply: XFX ProSeries 450W 80+ Bronze Certified ATX Power Supply
Other: Samsung M378B1G73EB0-CK0 8GB (1 x 8GB) DDR3-1600 (€40.00)
Total: €751.75

Here's the upgrade:

PCPartPicker part list: https://de.pcpartpicker.com/list/84jyTH
Price breakdown by merchant: https://de.pcpartpicker.com/list/84jyTH/by_merchant/

CPU: Intel Core i7-7700K 4.2GHz Quad-Core Processor (€363.70 @ Mindfactory)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (Purchased For €0.00)
Motherboard: Asus PRIME Z270-A ATX LGA1151 Motherboard (€163.84 @ Mindfactory)
Memory: Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory (€137.84 @ Mindfactory)
Storage: Samsung 850 EVO-Series 250GB 2.5" Solid State Drive (€101.80 @ Mindfactory)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (Purchased For €0.00)
Video Card: Sapphire Radeon RX 480 4GB NITRO+ 4G Video Card (Purchased For €0.00)
Case: Cooler Master MasterBox 5 (White) ATX Mid Tower Case (Purchased For €0.00)
Power Supply: SeaSonic EVO Edition 750W 80+ Bronze Certified Fully-Modular ATX Power Supply (€98.83 @ Mindfactory)
Total: €866.01

I'm also thinking about switching case, so if someone could recommend a good case i would be quiet thankful (The upgrade came because my dad needs a new PC, and i will be reusing my old parts for my dads build).