My 7900XTX Needs a Date (5900x or 5950x) Noctua or Assassin? CES Jealousy

So I'm that guy that bought a GPU before CES lol. Pretty happy with the AMD 7900 XTX for the most part, other than the complaints in the video. My CPU 3600x with stock cooler is loud, so I want to get a new cooler. Might as well upgrade the CPU while I'm down there :) Debating 5900x or 5950x, and wondering if my B450 Aorus Elite motherboard can even handle them?
Also debating between the Noctua D15 vs the Thermalright Peerless Assassin or Phantom Spirit 120. I've heard the Assassin can break down after awhile, and that Noctua, while expensive is the more reliable company. Will my CoolerMaster H500 even fit those 140mm fans? Noctua says it won't, but I've heard others make it fit.
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