most chieftec are made by Sirtec (they outsource to like 4-6 companies). a few are made by Delta like the GPS series (they also make antecs) and CWT makes their Super/Turbo series (they also make several corsairs). Delta PSU are pretty good overall but without an actual model number its hard to tell who made what.
Then things get fuzzier, Sirtec is another of the companys that can make excellent products but usually ends up makes generic messes. Just stick with FSP, theyre made by FSP and since its rated 85PLUS, should be at least a mid-range model.