What to look for when purchasing a Power Supply?

[chaz d.]

Ok, what are ALLof the things to take into consideration when buying a power supply?
What makes one better than the other?
What does all of the voltage input and output mumbojumbo mean?

Thanks for the help.
Chaz D.

 

[DonNagual]

This is one of the best threads out there on power supplies

http://hardforum.com/showthread.php?t=792566