What could be optimized in my component selection for a gaming and work PC?

I would like to put together a PC that I would like to use for playing but also for productive work such as Office but also for video editing.

As far as video editing and gaming are concerned, I'm not hardcore (video editing beginners and gaming rather Minecraft), but I still want to have potential upwards or a decent base (also like to tinker with Linux and am already a technology nerd here and there). Therefore, I would be very happy to receive constructive criticism of the following compilation.

First the plan: I have a fairly large case (see point 6) and because of the GPU prices I would like to do without one and use an APU with an ITX board. This should be enough for the bare minimum and later an additional ATX board comes into the case with Nvidia GPU, AMD CPU and water cooling. The case has already been bought and for the rest (not including the monitor) I would like to spend roughly 600 to 800 euro. The ITX board should then serve as a small private Minecraft server or the same.

1) CPU: https://de.pcpartpicker.com/product/HcPgXL/intel-core-i5-10600k-41-ghz-6-core-processor-bx8070110600k with or without K. Since K is cheaper, I would choose K, but can K be turned down so that the energy consumption is comparable to without K when I need less power?

2) CPU Cooler: https://de.pcpartpicker.com/product/4TpmP6/cooler-master-masterliquid-ml120l-rgb-v2-6559-cfm-liquid-cpu-cooler-mlw-d12m-a18pc-r2 I would like to start halfway cheaply and found it to be quite ok

3) Mainboard: http://Gigabyte%20Z590I%20AORUS%20ULTRA%20Mini%20ITX%20LGA1200 I think the board is oversized but somehow it appealed to me. Boards that cost half the price I didn't like in terms of quality and appearance. Feel free to suggest alternatives.

4) RAM: https://de.pcpartpicker.com/product/32nG3C/gskill-tridentz-rgb-16gb-2-x-8gb-ddr4-3000-memory-f4-3000c14d-16gtzr I wanted something in between costs, optics and speed and found this to be a good choice.

5) Hard disks: To get started, I would like to get cheap external hard disks and rely on storage from WD (Red HDDs labeled as white). Later I planned on a https://de.pcpartpicker.com/product/W69tt6/western-digital-black-sn850-1-tb-m2-2280-nvme-solid-state-drive-wds100t1x0e

6) PC case: https://de.pcpartpicker.com/product/y4n8TW/phanteks-enthoo-luxe-2-atx-full-tower-case-ph-es719ltg_bk The case is the first component that I already have or is therefore certain. I love to overdo it. Plenty of space for hard drives and fans, etc.

7) PC power supply: Here I'm faced with a small problem: On the one hand, I want to start small and need less power. A standard power supply is not enough to operate two systems. So far I have only found the https://de.pcpartpicker.com/product/KMx2FT/phanteks-revolt-x-1000w-80-platinum-certified-fully-modular-atx-power-supply-ph-p1000ps with 1000 W (I need about 300W at the beginning), with which you can build a dual system. I would like to have experiences here from users who have already set up a dual system. Have you found an alternative or how do you operate two systems (extend plugs)?

8) Housing fan: Is actually not a problem, because I have enough space and want to retrofit water cooling later.

9) Monitor: I'm still looking for an HDMI 2.1 4K 49 "TV for G-Sync. The https://www.mediamarkt.de/...42054.html almost became it, but I shy away from the black value.

If you also want to use the pc for video editing and want to be prepared for the future, I would prefer a ryzen 8-core, whose gaming performance would not be as good as with a similar 6-core, but it is perfect for video editing. You have to decide how much money you want to spend and which one you then take.

In the price range, the mainboard should not be more expensive than the CPU (itx mainboards are usually a bit more expensive)

I would then just take a very cheap graphics card from ebay, which would probably have the same performance as the apu.

You don't necessarily need a wakü and I would never recommend a 120 if a 240 fits into the case. You could either use the 240 version or simply a be quiet dark rock 4, which would give you a little more money for the CPU.

If you decide on the variant, I can also recommend something adapted to your budget.

Thanks for the tip. That with the eBay GPU would of course be a possibility where I will look around again. I chose the Intel because it is cheaper than AMD in this area. And if the computer later runs as a Minecraft server, then I no longer need a GPU. The "big one" should then have real power, which according to the current status will definitely be an AMD Ryzen.