I made some reading on Tom's Hardware and they speak highly about the Seasonic Focus Gold series, out of that, I think I can put another a few more 70ish SGD to buy a Seasonic PRIME Platinum. Can you tell me some reason why not to choose Focus series? I want to carefully pick the best, in budget, as possible

And I'm still concerned
whether 650W is enough (for this and this rig only, not thinking about future upgrade). So after using Seasonic, Corsair, FSP, and other calculators and read some charts, it seems 650W is enough (I think so).
My aim for the GPU is 3060Ti, not considering going 3070 or higher...
What do you think? I would love to learn more how to get enough juice...
i7-11700 + 3060Ti + 32GB RAM (upgrade later) = 650W enough?