If you can find your way to pay the extra go with the first build below, all parts are in stock. If not, go with the second build. You will lose the 4 slot mobo and have a lower power PSU with the second build.
I have been trying to stay away from downgrading the GPU, the GTX 1060-3GB or RX 580-4GB are much faster than the GTX 1050 Ti, makes for a much better gaming computer.
First Build
PCPartPicker part list:
https://it.pcpartpicker.com/list/wQjyd6
Price breakdown by merchant: https://it.pcpartpicker.com/list/wQjyd6/by_merchant/
Motherboard: MSI - B250M PRO-VDH Micro ATX LGA1151 Motherboard (€96.39)
Memory: Corsair - Vengeance LPX 8GB (2 x 4GB) DDR4-2400 Memory (€81.59)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (€61.02)
Case: Cougar - Archon ATX Mid Tower Case (€59.55)
Power Supply: SeaSonic - S12II 520W 80+ Bronze Certified ATX Power Supply (€77.06)
Operating System: Microsoft - Windows 10 Home OEM 64-bit (€25.00)
Other: EVGA GeForce GTX 1060 3GB FTW+ GAMING ACX 3.0, 3GB GDDR5, LED, DX12 OSD Support (PXOC) Graphics Cards 03G-P4-6367-KR (€284.41)
Other: Intel Pentium G4600 3.6GHz 3MB Scatola (€102.63)
Other: System Assembly (€25.00)
Total: €812.65
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-06-12 13:30 CEST+0200
Second Build
PCPartPicker part list:
https://it.pcpartpicker.com/list/NZBbHN
Price breakdown by merchant: https://it.pcpartpicker.com/list/NZBbHN/by_merchant/
Motherboard: MSI - B250M PRO-VD Micro ATX LGA1151 Motherboard (€80.92)
Memory: Corsair - Vengeance LPX 8GB (2 x 4GB) DDR4-2400 Memory (€81.59)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (€61.02)
Case: Cougar - Archon ATX Mid Tower Case (€59.55)
Power Supply: Corsair - CX (2017) 450W 80+ Bronze Certified ATX Power Supply (€68.89)
Operating System: Microsoft - Windows 10 Home OEM 64-bit (€25.00)
Other: EVGA GeForce GTX 1060 3GB FTW+ GAMING ACX 3.0, 3GB GDDR5, LED, DX12 OSD Support (PXOC) Graphics Cards 03G-P4-6367-KR (€284.41)
Other: Intel Pentium G4600 3.6GHz 3MB Scatola (€102.63)
Other: System Assembly (€25.00)
Total: €789.01
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-06-12 13:51 CEST+0200