Unfortunately, I can't use a lot of money. Only ~$800 budget. But I can still build a nice-ish computer with that.
Note: Unless you're literally using a piss poor 20$ PSU, it's very unlikely that it will backfire and kill your components.
I'm using a Rosewill powersupply, and I'm overclocking. You need to know what parts you're using to calculate voltage, and shoot for about 200W over that at least to cover for capacitor aging and potential lack of amperage. Brand doesn't matter, read reviews and find the one that is cheapest, most reliable, and best fulfills your needs.
Note: Unless you're literally using a piss poor 20$ PSU, it's very unlikely that it will backfire and kill your components.