How good is this computer?

I'd say pretty good, cost, that's up to you. You could go for even better GPU if you want to and PSU cold be stronger but that's about it. Should be able to play anything you want but some maybe not at top settings because of GPU.
 
Would you please provide me with the build you got for the same price that is better than the one I linked?😛
 
Here is the build:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-6700K 4.0GHz Quad-Core Processor (£260.28 @ Aria PC)
CPU Cooler: Corsair H80i v2 70.7 CFM Liquid CPU Cooler (£75.00 @ Ebuyer)
Motherboard: Asus Z170-E ATX LGA1151 Motherboard (£112.78 @ Amazon UK)
Memory: Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-2400 Memory (£53.99 @ Ebuyer)
Storage: Kingston SSDNow V300 Series 120GB 2.5" Solid State Drive (£30.92 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£37.98 @ Novatech)
Case: Corsair 200R ATX Mid Tower Case (£49.99 @ Amazon UK)
Power Supply: Corsair RMx 650W 80+ Gold Certified Fully-Modular ATX Power Supply (£79.99 @ CCL Computers)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£14.99 @ Novatech)
Other: GTX1070 (£275.00)
Total: £990.92
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-05-26 14:19 BST+0100
 
damn, this looks pretty good. How do you know the price of the new 1070 tho?
Also, would I be able to build this for myself if I have never done it before?
 
Check this link out
http://arstechnica.com/gadgets/2016/05/nvidia-gtx-1080-1070-pascal-specs-pricing-revealed/
It says 270 I threw in 5 extra to be safe if it goes 10-20 bucks high still go for it don't back out it is better than Titan X