yeah depending on ur setup, between 350 and 500ish is PLENTYYYY
if you have like dual video cards and like 6 hard drives RAIDed plus a lot of fans, ram, beast *** processor, and are planning on doing something heavy duty (ie video editing) you might wanna get something BIG around 600W+.
but if you are like 98% of people and have a regular old computer, a good 400w will do you fine.
like the above said, you need to make sure the pins match
the nicer PSUs come with the pre-sleeved cables which help with cable management