PSU 1080 Ti SLI

Hi, I've made a pcpartpicker list and my estimated wattage is 354W. https://uk.pcpartpicker.com/list/Jykf9G What would be the best wattage and best psu to get. Thank you

I built a pc yesterday and booted it up with windows 10 via a usb, that I got using the "iPad pro" method. Everything was going good, I installed games via steam, drivers, played the games for a long time then called it a night. I hit "update and shut down". I woke up today and got ready and...