I would be careful with recommending trying to price-optimize power supplies. Sustained/average power draw under load is not peak power draw, and tolerances beyond the rated PSU wattage vary by manufacturer and model. In the best case of using an inadequate power supply, it will constantly trip overcurrent protection. In the worst case, it will take other components down with it.
The OP is also looking into the RTX 5090, which is even more power hungry.
“They broke the law,” tweeted the motherfucker who never respected it in the first place…