AvoK95 wrotefor normal PC-s some people use viewtec (which is a chinese brand but its preety stable,if your running just an office pc)
i prefer enlight for pc-s like i3 and i5 IF THEY ARN'T GAMING (much)
as for gamers i like thermaltake or in win ect
but for an average gamer/user enlight is the best brand because its cheap and very stable and the watts rated are real
BTW these are all found on pcandparts.com