The only real tip you need is DON'T GET A CHEAP PSU!
A cheap-o PSU can cost you stability, reliability, and are much more likely to fry your computer. There are many good brands of varying wattage, just do research and take your time.
Most PSU's give both 20- and 24-pin capabilities.
The ones I've purchased have been few, but i guess that means they're good. Right now I'm using an Enermax, and it's served me well or almost 4 years.
Do research.
Find quality.
Do more research.
Get one with more power than you need, for when you upgrade. If you ahve a small case adn and afford it, get a modular PSU - they alow you to disconnect unneeded cords and help keep your case tidy, which leads to better airflow, which leads to less heat, which leads to longer lifespan.
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