Asad Javeed

Try Cinebench R20 and Furmark. Also try the 3dMark demo version on Steam.

I use 3DMark benches like TimeSPY and FireStrike.
 
Cinebench R 15 and 20(AVX) are good for CPU only.
 
I think game bences are good as well. 

Easily, systems do not draw at full load all the time, even when gaming. I got about 10min out of my 450W unit when I had a power outage earlier this year with an R7 3800x, 1080Ti, with tons of storage and fans, as well as my 34" UW monitor. 
 
Your system under real world max load only would draw like 280-300W anyways, and that is not sustained. So no concerns here!

I feel you lol, the VAT in Denmark is crazy high. it basically means all our products costs 25% more than the US. (Value Added Tax) since US doesnt have VAT its cheaper there (for the most part)

Well i would probably say 2tb would be good. If you dont edit videos at 4K then i dont think you would have a problem with 2. You can always upgrade

welcome. enjoy the PC

860 evo
860 QVO
thats a fine HDD

yeah. 500gb or more

I have computers with 250gb SSD and 500gb SSDs as boots, get a 500gb+ for boot.
you don't need the speed for every drive to be an M.2 PCIE drive.boot drive it can make sense but the rest should be SATA SSDs or HDD. (sata SSDs can come in m.2 form but will only work in some m.2 slots)

I personaly have a 500gb WD M.2 and a 1 TB Crucial M.2 and I can't be happier, and I'm soon getting 2x1TB Sata SSD's and I'll put them in raid0 for max speed. 

so basically i would recommend MP510 1tb. at this time nvme prices and storage in general have SKYROCKETED. if i was you then i would wait untill all this virus is gone. the mp510 goes for around almost 200 dollars at the moment. usually its 120 usd so yeah. but depends on your budget

500GB boot NVME SSD and then a 1tb SSD for games but I would also think about a 3-5tb HDD for videos, rarely played games and other stuff.

Thank you!!!!!

Mount & Blade....
I got hooked on the Viking Conquest ReForged edition for some strange reason, still play from time to time. Total time playing the franchise is at least 6 months by now.
 
Also Dark Souls...Probably have racked up a few good 6-8 months on playtime on that as well!

One issue I've had with this sort of enhanced power switch is how to power the power switch. I agree you'd probably want to use an arduino or similar, which needs to be powered on to read a signal from the fingerprint scanner. Some motherboards can keep supplying power through USB ports even when the rest of the PC is off. 
If you power the arduino externally, then the voltages of that and the motherboard might not "match," and I've found that optocouplers/optoisolators are the best solution. 

It's just for personalizing and having more of that.... DIY satisfaction really....