Seasonic Vertex PX 1000W Power Supply ATX 3.1 PCIe 5.1 (12V-2x6) 12 Years Warranty Cybenetics Platinum A Fully Modular RTX 5090 AMD RX 9000 Ready

Those are brands. You want a well know PSU brand. Technically Platinum is better than Gold but it's just by a little bit. But if you want the best, technically it is. As to cost, here's a 1000w Seasonic ATX 3.1 80+ Platinum and it's $270: https://www.amazon.com/dp/B0C571R3V8 I have that very unit in 80+ Gold, never had an issue.