What PSU to buy

Do you truly need 750W? Most modern, single GPU setups rarely need >450-500W if a quality PSU is opted for.

The SeaSonic Focus+ series is great quality, and appears to be in stock (in the US at least) moreso than the G2-G3 etc.
https://pcpartpicker.com/products/compare/bkp323,WrNypg,64cMnQ,jWFXsY/