kiss-method :
Which motherboard do you have?
I would go with Intel line since it'll minimize costs possibly. Or even with a bios update you could look at Gen 7, or even i7
It's not exactly minimizing costs. G4560 is already 7th-gen. Intel is expensive even for the older generations that are limited to quad-cores. They are still good processors though.
Tensus :
volkgren :
I would get the Ryzen 5 2600 + B450 mobo if it is available to you for a reasonable price compared to 1st-gen Ryzen. You could sell your G4560 and mobo and it should make it about the same cost as the i5-6600K.
Can only spend £180
UK has a really good price for the 1600X. I'd go for that + B350 motherboard. Only thing is you only have enough leftover for a cheap motherboard and the 1600X doesn't come with a cooler. You might be better off with the 1600 since it comes with a cooler.