The closest Microcenter is in Denver, but they have laptops from $130-$5000:
https://www.microcenter.com/search/search_results.aspx?N=4294967288+4294811237+429481 7517+4294817438+4294807302+4294807185+4294807310
You were looking at a PC tower I think:
https://www.microcenter.com/site/content/custom-pc-builder.aspx
GPU Guides:
https://www.tomshardware.com/reviews/gpu-hierarchy,4388.html
For towers, I think it all starts with a good motherboard/case which can handle upgrade ands and add-on components.
I prefer AMD personally. Heard Intel was expanding more into the server side more than gaming but not sure.
With the FTX and crypto collapse, GPUs should be coming down in price hopefully.