If your still around in about 3 to 4 months time from now i can give you a 7600k processor, 2 sticks of ddr4 (2x16gb) 2400mhz ram at 15-15-15-35, some takstar pro 80 headphones and a gtx 1070 (if nvidia releases gtx 1180 that is), the reason being is that i am upgrading from this current pc of mine to a ryzen system.
Free of charge, saving you hundreds of pounds, £500 for everything else is well yea better you have more headroom to be able to afford everything else otherwise 500 pounds for everything really is a tight squeeze of a budget.
For instance realistically you can buy a 1080p monitor for £100 so you have £400 left,
Keyboard and mouse realistically would come to £20-30.
Operating system if you buy it from overclockers is £100.
Graphics card 1050 or 1050ti is £120 to £ 150.
8 gb of ram is like £100 .
As for the processor... as to what you can afford don't get me started on that but a
My basket at Overclockers UK:
Total: £107.69 (includes shipping: £8.70)
You don't need to buy a graphics card if you buy this processor.
You get the idea, is a tight squeeze of a budget but yea but i can see if you buy new, it will have to be bottom end pc hardware to afford that.
Buying used pc hardware is more realistic varying on the price etc,