Thanks for the advice, but from pcpartpicker both PSU you mentioned are more expensive than the seasonic focus 650W.
For the mobo is it this one? I think your Asus tuf is the same one as mine mentioned.
https://ca.pcpartpicker.com/product/whMTwP/asus-tuf-gaming-x570-plus-atx-am4-motherboard-tuf-gaming-x570-plus
As for memory, since it's on sale for less than $90 on newegg (grey one cost $84.99) when I purchased them, I think it's worth it.