Buying the right "size" power supply for your system is important for making it run at its best efficiency, but not all power supplies are built equally. 80+ ratings which rank from "normal" to bronze, silver, and gold determine how good your PSU's best efficiency will be. The higher the 80+ rating of your PSU, the less electricity your system will waste.
The build quality of one power supply to another can vary dramatically so you also have to be sure to protect yourself in the event that something goes wrong. Most of the power supply brands at NCIX carry from 3-5 year warranties, so make sure you select one that is fully supported so that you will be protected in the future if something does go wrong.
Linus Sebastian
NCIX PC Advisor and "Tech Tips Guy"