That model has always been made by Delta the BP 350/500 are made by FSP. The companies that do not make their PSU's and are just rebrands are trickey like that. Channel Well makes the CX junk for Corsair not something I would buy or build with. The XFX I listed above is a very good PSU never had a bad one and I use the video cards as well, rebates are a little slow as with usally all rebates but never had a problem with the company. All of their PSU's are made by seasonic.
Here is something you might like to look at.
PSU Makers: 0-9 And A-B : Who's Who In Power Supplies, 2013: Brands Vs. Manufacturers