1: OK, looks like we're looking at an Intel build.
2: Again, OK, no streaming, so we're still looking at an Intel based build then. Just asking about the old build, we often get people posting with fairly current hardware where just moving from, say an i3 to an i5 would be enough of an improvement.
With so much happening with graphics cards at the moment I'll suggest you hold off on this purchase, prices have been massively inflated for the best part of a year now and are only just beginning to drop to normal, also the current RX580 is plenty good enough for 1080 gaming so I'll suggest doing the CPU/MB/RAM upgrade first and add a faster graphics card when you upgrade the monitor.
And what is your budget in Euro?