Steam Machine Build - Opinions

Here is a better build:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-6100 3.7GHz Dual-Core Processor (£92.91 @ Amazon UK)
Motherboard: Asus H110M-K Micro ATX LGA1151 Motherboard (£47.99 @ Amazon UK)
Memory: Corsair Vengeance LPX 8GB (1 x 8GB) DDR4-2400 Memory (£36.94 @ Amazon UK)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£42.99 @ Amazon UK)
Video Card: Palit GeForce GTX 1060 6GB 6GB Dual Video Card (£229.98 @ Ebuyer)
Case: Zalman Z3 Plus ATX Mid Tower Case (£32.99 @ Novatech)
Power Supply: XFX TS 430W 80+ Bronze Certified ATX Power Supply (£38.70 @ Amazon UK)
Total: £522.50
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-10-10 14:22 BST+0100
 
Here is the list with smaller case:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-6100 3.7GHz Dual-Core Processor (£92.91 @ Amazon UK)
Motherboard: Asus H110M-K Micro ATX LGA1151 Motherboard (£47.99 @ Amazon UK)
Memory: Corsair Vengeance LPX 8GB (1 x 8GB) DDR4-2400 Memory (£36.94 @ Amazon UK)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£42.99 @ Amazon UK)
Video Card: Gigabyte GeForce GTX 1060 6GB 6GB Mini ITX OC Video Card (£232.38 @ More Computers)
Case: Fractal Design Core 1300 MicroATX Mini Tower Case (£36.95 @ Amazon UK)
Power Supply: XFX TS 430W 80+ Bronze Certified ATX Power Supply (£38.70 @ Amazon UK)
Total: £528.86
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-10-10 14:54 BST+0100
 
Solution