>>>This should probably be a sticky <<<<
This is a list of who actually makes each PSU as of 2013.
http://www.tomshardware.com/reviews/power-supply-oem-manufacturer,2913.html
Buyers beware there are loads of junk units about so pay attention to who is the maker behind the label.
As with anything, read reviews. Ask around if unsure. A bad choice is power supply will 9 times out of 10 come back to bite you in the arse.
Peace.