re: Gaming computer build

I'm not in a position to do any searching right now, but I would lean away from builds with a 3090 and focus on those with a 3080. Sure, the 3090 is the best card you can buy now, but you're looking at twice the price (for the card) for about a 10% uplift in performance. The GPU apocalypse isn't going to last forever. Save that $1,000 and use it to upgrade your GPU a generation sooner than you might have, otherwise. Even with crazy price inflation, a hypothetical 4080 will likely cost less than $1k total, and it will likely crush a 3090 in performance.

ETA: Actually, as an addendum, if you are going to primarily/exclusively play Flight Sim, I might go 6800xt for the extra vram, but it wouldn't be my general choice, as I think DLSS is poised to vastly set Nvidia apart from AMD for the short to mid term.