I already got the PS5. I'm just not about to play it at 30FPS. I did that with the PS3 and I'm not doing it again 20 years laterGet the 5090, wait for the PS5 for when GTAVI drops. If VI is the reason you're getting a PS5 then you might as well wait. It will be cheaper and there will likely be a product upgrade by then. If you get one now you spend more money and will likely have a weaker PS5 for VI at release.
Sony will release (if they're smart) a Pro model that aligns with with the release of the game. If they take a page out of R* book, they'll milk the PS5 for all it's worth before releasing the next console.
I have a feeling PC won't be seeing a port until 2027.