If you want a 1440p non ultrawidde go for either Asus VG27QAL1A, Dell S2722DGM or Gigabyte M27Q-P.
The 2nd one is a VA panel which will be your best budget option and if you don't care about response time being slower than IPS then it can look better in non competitive games and the 3rd being cheaper ips option
are you fully committing to the white aesthetic? cause black fans cpu cooler and power supply. Anyway id remove the extra thermal paste because you dont need it. i'd switch the power supply too because it has bad coil whine
First of all the 7600 comes with a cpu cooler so unless you want one for aeshetics id go for this. (Can go phantom spirit or ag400 or assassin x if wanted one)
Motherboard: Pretty much one of the cheapest options with wifi, if you dont like the black and silver you can go for the msi pro b650m for 10 more dollars which is purely black.
Cheaper and still very good storage more than enough of your needs.
GPU general rule of thumb is to go for the cheapest AIB (version), its black/silver so if you want can get pure black for 10 dollars more. The 6900xt is much faster and can handle 4k aswell.
Case is personal preference but you choose a way too expensive one for no reason, this one is a smol like the matx you chose and is nice.
PSU is the cheapest high end one good for this budget
Yep 😂 my bad