[Here are some changes](PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i5-6500 3.2GHz Quad-Core Processor | €212.00 @ Amazon Italia |
| Motherboard | MSI B150M BAZOOKA Micro ATX LGA1151 Motherboard | €78.20 @ Amazon Italia |
| Memory | G.Skill NT Series 16GB (2 x 8GB) DDR4-2133 Memory | €60.00 @ Amazon Italia |
| Storage | Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive | €49.40 @ Amazon Italia |
| Video Card | Sapphire Radeon RX 480 8GB Video Card | €289.99 @ Amazon Italia |
| Case | Corsair SPEC-02 ATX Mid Tower Case | €68.07 @ Amazon Italia |
| Power Supply | SeaSonic 520W 80+ Bronze Certified Fully-Modular ATX Power Supply | €88.40 @ Amazon Italia |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total | €846.06 | |
| Generated by PCPartPicker 2016-07-30 03:39 CEST+0200 | ) |
Okay now for an explanation. You had a 6600K which is an unlocked cpu that needs a z170 board to overclock with a b150 board. Now while they would work together you wouldn't be able to overclock and you would just be wasting money so i listed a 6500 instead. I switched the ram to 2133 16gb instead of 2400 and upgraded the gpu to a 480 but you should wait for a custom cooler non reference design on the card.