PC Parts List

Issues:

1) z170 board may not support 7600k without bios update which would require a skylake CPU. You need a z270 to use your CPU for sure)

2) that SSD is slower than a hard drive in some tasks.

3)if you got a r5 1600 and a b350 should save you enough money to get a better GPU on day one and much better performance because of it. You could also drop the CPU cooler as a 1600 can get to 3.7/8 with the stock cooler.

You can do way way better in terms of both system balance and performance.
What's your total budget?
I'll make a list.
Overclocking isn't good value until you hit the 7700k or go for Ryzen.
An i7 7700 non-k and b250 board will cost the same as a 7600k/Z series board and perform far better.
Keyboard is also a third party no-name slab of plastic, you'll want to improve on that front too.

Ryzen would be a better choice over an i5 due to it's higher thread count and increasing reliance on thread utilization in more recent titles, and trends towards higher CPU utilization overall.
I can't tell however unless you give me a budget here, I have nothing to work with.

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 1600 3.2GHz 6-Core Processor (£194.16 @ Ebuyer)
Motherboard: MSI - B350 TOMAHAWK ATX AM4 Motherboard (£99.75 @ Amazon UK)
Memory: Corsair - Vengeance LPX 8GB (2 x 4GB) DDR4-3000 Memory (£66.12 @ Aria PC)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£41.88 @ Aria PC)
Video Card: MSI - Radeon RX 570 4GB GAMING X Video Card (£188.65 @ CCL Computers)
Case: NZXT - S340 (Black/Red) ATX Mid Tower Case (£66.93 @ CCL Computers)
Power Supply: SeaSonic - 520W 80+ Bronze Certified Fully-Modular ATX Power Supply (£68.80 @ Alza)
Total: £726.29
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-22 12:35 BST+0100

Or

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 1600X 3.6GHz 6-Core Processor (£227.94 @ Aria PC)
CPU Cooler: Noctua - NH-D14 65.0 CFM CPU Cooler (£64.25 @ CCL Computers)
Motherboard: MSI - B350 TOMAHAWK ATX AM4 Motherboard (£99.75 @ Amazon UK)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory (£121.77 @ CCL Computers)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£41.88 @ Aria PC)
Video Card: MSI - Radeon RX 570 4GB GAMING X Video Card (£188.65 @ CCL Computers)
Case: NZXT - S340 (Black/Red) ATX Mid Tower Case (£66.93 @ CCL Computers)
Power Supply: SeaSonic - 520W 80+ Bronze Certified Fully-Modular ATX Power Supply (£68.80 @ Alza)
Total: £879.97
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-22 12:39 BST+0100

Spend a few bucks over budget for the Deathadder Elite, well worth it.
Or if you REALLY can't save for it, sub it for this: https://uk.pcpartpicker.com/product/648H99/logitech-mouse-910004069
PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 1500X 3.5GHz Quad-Core Processor (£169.99 @ Amazon UK)
Motherboard: Asus - PRIME B350M-A Micro ATX AM4 Motherboard (£68.52 @ Amazon UK)
Memory: ADATA - XPG Z1 8GB (2 x 4GB) DDR4-2800 Memory (£50.63 @ Amazon UK)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£41.88 @ Aria PC)
Video Card: MSI - GeForce GTX 1070 8GB Video Card (£302.66 @ Amazon UK)
Case: Thermaltake - Versa H22 Window ATX Mid Tower Case (£26.80 @ Aria PC)
Power Supply: Corsair - CXM 450W 80+ Bronze Certified Semi-Modular ATX Power Supply (£48.36 @ Ebuyer)
Monitor: LG - 24MP48HQ-P 23.8" 1920x1080 60Hz Monitor (£94.97 @ Amazon UK)
Keyboard: Rosewill - RK-9000V2 Wired Standard Keyboard (£43.94 @ CCL Computers)
Mouse: Razer - DeathAdder Elite Wired Optical Mouse (£58.74 @ Aria PC)
Total: £906.49
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-22 12:38 BST+0100

The list I posted will perform way better than either of the two you just replied to.
The 1600 offers little more in terms of gaming performance, those extra two cores are barely utilized, even in more CPU heavy titles.

An SSD is a luxury, not necessarily a must have.
I believe that money is better spend on a 1070 and quality peripherals first and foremost.
Get an SSD later down the line if you want.
The 850 Evo usually hangs around the 85 quid mark and is a good buy.
Keep OS, software and a few low capacity games you want faster loading times in on there, does nothing for performance.

[PCPartPicker part list](https://pcpartpicker.com/list/tFpJD8) / [Price breakdown by merchant](https://pcpartpicker.com/list/tFpJD8/by_merchant/)

Type|Item|Price
:----|:----|:----
**CPU** | [Intel - Core i5-7500 3.4GHz Quad-Core Processor](https://pcpartpicker.com/product/QbGj4D/intel-core-i5-7500-34ghz-quad-core-processor-bx80677i57500) | $188.49 @ OutletPC
**CPU Cooler** | [Cooler Master - Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler](https://pcpartpicker.com/product/hmtCmG/cooler-master-cpu-cooler-rr212e20pkr2) | $24.88 @ OutletPC
**Motherboard** | [ASRock - B250M-HDV Micro ATX LGA1151 Motherboard](https://pcpartpicker.com/product/KWjWGX/asrock-b250m-hdv-micro-atx-lga1151-motherboard-b250m-hdv) | $62.99 @ SuperBiiz
**Memory** | [Kingston - FURY 8GB (2 x 4GB) DDR4-2400 Memory](https://pcpartpicker.com/product/T7Trxr/kingston-memory-hx424c15fbk28) | $67.48 @ Amazon
**Storage** | [PNY - CS1111 240GB 2.5" Solid State Drive](https://pcpartpicker.com/product/vwPzK8/pny-internal-hard-drive-ssd7cs1111240rb) | $79.99 @ Amazon
**Video Card** | [Asus - Radeon RX 580 4GB Dual Video Card](https://pcpartpicker.com/product/XYDzK8/asus-radeon-rx-580-4gb-dual-video-card-dual-rx580-o4g) | $204.99 @ SuperBiiz
**Case** | [NZXT - S340 (Black) ATX Mid Tower Case](https://pcpartpicker.com/product/ms6BD3/nzxt-case-cas340wb1) | $52.98 @ Newegg
**Power Supply** | [SeaSonic - S12II 520W 80+ Bronze Certified ATX Power Supply](https://pcpartpicker.com/product/fZyFf7/seasonic-power-supply-s12ii520bronze) | $44.89 @ Newegg
**Monitor** | [AOC - G2260VWQ6 21.5" 1920x1080 75Hz Monitor](https://pcpartpicker.com/product/hqmxFT/aoc-monitor-g2260vwq6) | $119.88 @ OutletPC
**Keyboard** | [Cooler Master - Lite L Wired Gaming Keyboard w/Optical Mouse](https://pcpartpicker.com/product/d2x9TW/cooler-master-lite-l-wired-gaming-keyboard-woptical-mouse-sgb-3040-kkmf1-us) | $49.99 @ Amazon
| *Prices include shipping, taxes, rebates, and discounts* |
| Total (before mail-in rebates) | $926.56
| Mail-in rebates | -$30.00
| **Total** | **$896.56**
| Generated by [PCPartPicker](http://pcpartpicker.com) 2017-05-22 08:52 EDT-0400 |

Pick up the hdd later so you don't have to reinstall your os on it. 240gb is not alot but should be able to hold you over.Also do you have the os already because I didn't see It in your parts list.

Quite a poor list for the money, @Op is also in the UK, not the US.
Use BB code.

I would pick the 1600 and an ssd,

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 1600 3.2GHz 6-Core Processor (£194.16 @ Ebuyer)
Motherboard: Gigabyte - GA-AB350-GAMING 3 ATX AM4 Motherboard (£102.00 @ Aria PC)
Memory: Corsair - Vengeance LPX 8GB (2 x 4GB) DDR4-3000 Memory (£66.12 @ Aria PC)
Storage: Samsung - 250GB 2.5" Solid State Drive (£84.99 @ Amazon UK)
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive (£37.99 @ Aria PC)
Video Card: Gigabyte - Radeon RX 570 4GB Gaming 4G Video Card (£168.99 @ Amazon UK)
Case: Antec - GX500 ATX Mid Tower Case (£40.99 @ Amazon UK)
Power Supply: Corsair - CXM 450W 80+ Bronze Certified Semi-Modular ATX Power Supply (£48.36 @ Ebuyer)
Monitor: LG - 24MP48HQ-P 23.8" 1920x1080 60Hz Monitor (£94.97 @ Amazon UK)
Keyboard: Rosewill - RK-9000V2 BR Wired Standard Keyboard (£43.94 @ CCL Computers)
Mouse: Cooler Master - CM Storm Recon Wired Optical Mouse (£18.00 @ Kustom PCs)
Mouse: Cooler Master - Xornet II Wired Optical Mouse (£18.99 @ Amazon UK)
Total: £919.50
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-22 18:57 BST+0100

The mouse something to choose between.

That's the thing though; you can afford the 1070, no need to nerf your GPU performance.
Do you mean if you can't spend 900 pounds?
I can make a cheaper list if you want.

For the monitor in those builds you don't really "need" a gtx 1070 as well to do some good gaming. The gpu is probably the first thing you're going to upgrade anyway.Maybe aside from ram that is.The other parts imo will be longer with you.

Is mostly a price/performance debate. If one is certainly better in some games is it the gtx 1060 ,some games just prefer Nvidia more.In my build the RX 570 was within budget,hence that choice.