de.pcpartpicker.com
Do you need an IPS panel for professional needs? Because all those new, 1080p, freesync displays seem to be VA panels and I'd actually recommend going for one of them instead of concentrating on IPS. 225€ for 1080p, 144Hz and FreeSync is a nice offering imo. Those newer VA panels are nice and variable refresh rates are a godsend, especially on "lower" end builds.
For the rest: You have to go as cheap as possible. A RTX 2060 costs 330€ (cheapest model btw) the monitor is 225€, together that's 55% of your total budget.
I don't like the mainboard, mostly because I'm not sure if they were updated to support gen 9 down the road. They definitely can, the question is: Are they coming with the newest bios?
CPU is just 4cores/4threads. If you can, take the i5 9400F instead, but it's 65€ more expansive and over the budget.