Pcpartpicker is your friend. You can even check other builds if you're not sure about part compatibility and barring the occasional extremely good deal, building your own is usually much cheaper. (I stand correctd, it may be different state-side)

Other than that, it all depends on how you game: if you want good fps in 1440p you'll want one of 12gb+ GPUs, otherwise for 1080p you can get away with a nvidia 5060 / amd 9060. RAM pricing is absolutely obscene as you well know, but you can do a DDR4 build if it's significantly cheaper than the current DDR5 in your area. Also if you do do a DDR4 build, you might go for a AMD AM4-socket cpu, since they're easier to find.