Is more than 750w necessary? I had been looking on pc part picker and most of the builds with that GPU and CPU have a 750w PSU? As for SSDs, I can recycle the nvme and sata SSDs from my current system.
750W quality psu is more than enough.
My 7800X3D with tuned ddr5 at 6200 MHz and bios set to keep it boosted as high as possible (no OC possible though) and it never exceeds 70W power draw.
The spikes of the 3000 series aren't as bad anymore thanks to driver updates and the 4000 series is Kite efficient and has even less power spikes.
So 750W would be enough for an overclocked 3090 or 4090.
About nvidia GPUs:
DLSS is often better than TAA. I use it as my anti aliasing method in ACC and I save performance due to it too.
Win/win.
If you're using fullscreen without nvidia surround (triples), you can also use DLDSR, which takes quite a bit of performance but enhances the image quality a lot and applies good anti aliasing.
So these two features would make me buy an nvidia card right now.
However if you're someone who uses fxaa instead of msaa to have 150 fps instead of 110 fps, then you don't need it at all.
Also, apparently (I never found a real benchmark proving this), nvidia gpus perform a bit better in VR.
What's more important though: some non-mainstream VR stuff like OpenXR doesn't support AMD gpus that well or fore some features, which can make the experience a big difference.
But I have no real experience with this, so it's just "what I've read" and it shouldn't determine your decision without further research.
Rest of the system looks good!
I have the Gigabyte B650 Gaming X AX and I'm super happy with it. Maybe you don't need to splash out the extra money? The gaming x v2 has a pci-e 5.0 nvme slot now.
And I would recommend to buy Kingston ram with at least 5600 CL36 or faster.
They are 99,999% sure SK Hynix sticks, which easily run 6200 with tuned timings.
I witnessed a few cases of me recommending Kingston ram and them getting Corsair or Patriot with 6000 profiles that didn't boot with the xmp/expo profile applied.
They all had Samsung sticks inside instead of SK Hynix.
But Kingston doesn't seem to like Samsung, so all their higher range modules get SK Hynix