To be honest we could all give an option and sit here forever debating them, maybe find some that take your fancy and post some links that we can look at and let you know what we think? For a guide of what you can get for under £1000 use pcpartpicker and look at the gaming builds under £1000.
As a guide you want an i5 processor or equivalent AMD (use cpubenchmark to see how they compare), a good GPU (1060 is very good value if you don't use 4K - or AMD equivalent of course), 16gb of ram (8 will do but 16 is better) and at least 1TB of hard drive. An SSD for your windows installation is always a benefit (128GB will be more than enough)
You could also go on pcspecialist and create your own custom build - that way you get exactly what you want.
Any questions just post them here - good luck!