I use UltraWides. I prefer them over 4k.. i just love the screen real estate! I am also going to be building a new PC. Same CPU as you, whatever flagship nvidia card (3090 with 24g ram more than likely). The 10900k should be more than enough for my needs. Although both intel and nvidia have online events nest week, so we can see the actual products and when we can order. ( everything has been "leaks" so far.)