New PC

Welcome. So here's the main thing. There is no need for a 3080 to game at high settings on 1440p. You miss your budget by a pretty wide margin unless you go with an RTX 3070. The decision is yours, but you could have a better overall system, cheaper, if you got the appropriate GPU. There's not $419 worth of difference between the two at these prices. There will be a whole new line of cards from Nvidia out in less than a year that will perform better in every way than this generation. We all hope those will sell much closer to their MSRP. If there is ANY hint of disappointment in a 3070 should you take my advice, you could get a shiny new 4070 that will likely outperform the 3080. I'll bet you'd not feel the need.

That said, here's a couple of sample builds for you:

https://www.digitalstorm.com/configurator.asp?id=4147382

https://www.digitalstorm.com/configurator.asp?id=4147384

The two are nearly identical except for the motherboard. It is unfortunate that we don't have more mobo choices for the Intel processors. The fact is, the Maximus XIII Hero is overkill with features you'll never use. The MSI Gaming Pro Carbon for the AMD build, however, is a very nice step-up from the base mobo at a reasonable price. The two CPUs are are nearly identical in performance. There will never be a perceptible difference.

Both have all SSD storage that will be substantially better than having a mechanical drive. It's quite easy to add more SSDs to these when needed. As hoserator and Onkel_Ken mentioned, the Samsung 980 PRO is one of the fastest NVMe SSDs you can get, and the best choice for your primary drive.

These are the best recommendations I can make for your budget. You are free to play around with either config until you get where you want to be. The main emphasis here is that I hope you won't waste your money on the wrong GPU.