From the ferelxyx budget, I would remove the keyboard + mouse and put a wired one and a gaming mouse, to have enough dpi's and thus improve the issue of nodes and mask selections.
And from the monitor I would go to a semi-professional one, forgetting about the ips leds that are not yet very refined. The leds they use are blue and distort colors. Look at the Eizo IPS non-led that for the quality they give and the price are fabulous (about 350-390€), or some Dell. If you have the patience for the leds there are Eizo led with white leds but prepare your wallet. That said, the warranty is 5 years of replacement, nothing of leaving you without a monitor until it is fixed.
Also, no matter how many monitors you have if you do not calibrate you do nothing. You can bring colors closer, but you will never hit the mark completely.