If you're going for that kind of monitor, I'd consider upping the GPU to at least a 2080 or better. With ultra high refresh rates you really need a beefy GPU. The 2070 is fine for most use but if you plan on getting super high details, you need a beefier GPU.
As @MrN1ce9uy suggested consider getting an Freesync Monitor much cheaper but Good as Nvidia now support them, check the monitor that supports that.
I would consider getting a 240MM AIO liquid cooler for the cpu.
i heard off a few people that that screen isnt great.. a few reports of flickers and washed out colour 1s you get past 120hz.
that being said.
699 for a screen can get you a bitrate 8bit-10bit/10bit simulated (10bit for productivity) 120hz 1440p and hdr
Thank you everyone for suggestions! I am looking into them, and also forwarding to my friend that is helping, as I actually don't know much about computers and have to look up everything you all are saying 😁