Ok, 450 is enough, even 430 will do. You can go any way want, but if you want to know my opinion, I would rather save on CPU then on PSU. Bad PSU can kill other components which cost way more.
Anyway, few good choices for your build: https://in.pcpartpicker.com/products/compare/FQ648d,TgW9TW,4Vzv6h/