I'm hitting a big stump trying to find a good enough PSU Manufacturer :I
Generally, Seasonic is a safe choice.
What about Corsair, XFX, EVGA, and BeQuiet?
You posted, "Who are the PSU Manufacturers are trustworthy and reliable?". They are not manufacturers. Depending on brand and model, they have different manufacturers making it for them. You can find out the manufacturer for each model via the following, link
Warlock, thank you for posting that link. Very informative and its a great comprehensive list. And I second your choice of Seasonic.