Sounds good, but I have some questions.

B450 Tomahawk MAX, thought of this one, really popular, but is it actually that great?

About RAM, the Patriot one has CL17-19-19-39 timings if I'm correct ...

Making it clear:
I'm asking for help in finishing a build for 144hz 1440p gaming build

Q. What is your budget and currency?
A) Around HUF500 000 for the PC parts and around HUF150 000 for a moni ...

Kind of a final check.

Thinking of this:

GPU: Gigabyte RTX 2070 Super Gaming OC 3X
https://www.pcx.hu/gigabyte-rtx2070-super-gaming-oc-3x-8g-gv-n207sgaming-oc-8gd-videokartya-723770

CPU: AMD ...

I really appreciate your help!
I think I'm going to stick to the MAG271CQR since it's cheaper than the others (except the last one you recommended), though I saw a lot of people saying deadpixels and ...

I won't be re-using any parts from my current PC. I'll buy a brand new one.
But anyways it contains these:

MOBO: M5A97 LE R2.0
CPU: AMD FX-8350
GPU: AMD R9 380 4GB
RAM: 2x4GB DDR3
SSD: 120GB ...

Q. What is your budget and currency?
A. More about this below

Q, What will you use the PC for?
A. 144hz 1440p gaming. More info below.

Q, Do you need a monitor? If not, what monitor(s) will ...