Question Are these parts all comparable, and do you have any suggested changes?

[93482592358]

Will the parts I listed all be compatible? (I'll be taking storage and the PSU from my current PC) https://ca.pcpartpicker.com/user/3547238478/saved/ccgzf7
Also, should I go with the NH-D15 or the D15S? (it looks like the second fan of the D15 will block the fan of the 3080/3090)
It also says that the PSU I have is to long for the case, however I did research and I'm confused as to whether it will work or not as some sites say it wont work at all, and some say it will fit fine.

 

[Lutfij]

How did you get a hold of the 4900x? For your cooler, I'd ask you to go with an AIO, at the very least a 240mm AIO or a 360mm AIO at the best. How old is the PSU? Most likely you're going to have to get a higher wattage, reliably built PSU for the new GPU. Speaking of recycling, what were your prior specs?

 

[93482592358]

How did you get a hold of the 4900x? For your cooler, I'd ask you to go with an AIO, at the very least a 240mm AIO or a 360mm AIO at the best. How old is the PSU? Most likely you're going to have to get a higher wattage, reliably built PSU for the new GPU. Speaking of recycling, what were your prior specs?

I don’t like any type of water cooling as it seems prone to issues, whereas I have been running air cooling for 7 years in my pc with no issues. That’s why I chose the D15, since I did a lot of research and it seems to have similar performance to water cooling. My current system is https://pcpartpicker.com/list/MTyywh
Are you sure the 750W I currently have won’t be enough, and which PSU do you recommend? (I will be doing moderate overclocking)

 

[93482592358]

https://ca.pcpartpicker.com/list/WhNWV7
Questions:
What changes would you recommend to this build, and will the EVGA G2 750W fit in the case I chose? I don't want to buy an entirely new power supply because of the 5 mm difference, so I'm wondering if it would work.
Is it worth stepping up to the 3090? The PC will be used for a lot of tasks, such as programming, 3D modelling/rendering, 4K gaming on maximum settings (aiming for 100FPS+), stocks/cryptocurrency trading, watching movies/shows in 4K, etc.
Will the LG monitor I listed will look fine in a dark room? I did some research and I am confused as to whether its a good choice or not, and does it have a big difference from the 1440p version?
Is the NH-D15S a better choice than the regular D15? The regular D15 looks like it would block one of the fans of the 3080.
Thank you in advance.