Hi Birdseye.
A lot depends on your budget, I am in Oz but generally you don't have to spend a heap to create a reasonable gamer.
There is a site
https://pcpartpicker.com/ that can help you build a rig before you spend you Euros/Pounds and it will give you a good start.
I recently built a new PC after being out of the game for a few years, as it happened I went above the call but thats the way I roll. My rig runs SH3 at 400+ frames and SH4 at 200+ frames with all graphics maxed out.
Like I say it depends on your budget.
Regards