Please go with a pre built system right now. Gpu prices are way out of wack right now. Something with either a core i5 or Ryzen 5, Rx580 8gb or 1060 6gb (please go with these variants and not the ones with less vRAM you might as well get a cheaper card instead), 8 gb of ram, and any power supply above 500w. I'll also suggest getting a 144hz monitor. Don't worry about getting g-sync if you get a nvidia gpu because it won't really help much unless you also plan on playing more cinematic and single player games. Only consider 16 gb of ram and either an i7 or Ryzen 7 if you plan on doing content creation, video editing, and streaming