Forget brands.....buying by brand name is a sure fire way to disaster.
PSU manufacturers are like car manufacturers......I'm a Porsche kinda guy myself but I will use Ford for this example since I have never owned one.....if you're in a sports car club, could you say "the Ford is a good performing car" ?
You might say for example ..... "The Ford Mustang is a decent performing little sports car for the price" and some will argue but some will agree......but would anyone agree with you if you said "The Ford Escort is a decent performing little sports car for the price" ....same thing.
PSU manufacturer's make PSU's to meet market segments. Just because Ford makes the Escort, doesn't in and of itself make the Mustang a bad car. (Let's please avoid the Mustang's worthiness and stick to the point plz).
Let's use Silverstone as our example .....
Does Silverstone make great power supplies ? Yes
Does Silverstone make crappy power supplies ? Yes
Silverstone Element ST85EF 6.0 Performance Rating
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=164
Silverstone Zeus ST85ZF 9.5 Performance Rating
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=5
If I said go out and buy a 850 watta PSU from Silverstone and you came home w/ a ST85ZF, you'd probably be happy w/ that 9.5 rating.....but if you came home w/ the ST85EF (only 1 letter different in model no.)\, you'd probably never talk to me again.
Same is true for most manufacturers....and while you might assume that buying within the same line is "safe" , this is something that can not be guaranteed. Silentpcreview.com writes:
When it comes to the noise they make [or build quality], PSUs of the same brand, even of the same series, are not that closely related sometimes. While some PSU brands are pretty consistently quiet (Seasonic is a good example), individual models still vary. Some brands are less consistent. This is especially true of brands whose power supplies are made for them by OEMs, often more than one at the same time, for the same or similar series. Which brands have their PSUs made by other companies? Why almost all of them — all but three names on our recommended lists: Seasonic and Fortron-Source / Sparkle (closely related), who actually manufacture their own products. Enermax used to, but some of their products are now subcontracted out; we don't know what percentage or to who.
So be warned. Don't assume that since Super Quiet 500 received an Editor's Choice award, the same brand's Ultra Silent 1000 must be very quiet [or equal in build quality] too. If we have not reviewed it, if it's not on these lists, it's best not to assume. At least inquire in the forums. SPCR does not make assessments of products without examining them, and we generally choose not to review products that don't meet our minimum requirements for "quiet". The reviews take a great deal of time and effort, and we prefer to save it for better products. So... sometimes "holes" in our recommendations of products in a series may exist because those models simply did not make the grade.
In short, read the reviews. I start here:
http://www.silentpcreview.com/Recommended_PSUs
as SPCR does a through analysis of both build quality / electrical performance and acoustical performance. After that I go and look for another review here:
http://www.jonnyguru.com/modules.php?name=Search
If I am happy with both, and the pricing, I've got my purchase settled.
My "short list" for readily available, and affordable units (alphabetical by category).
Outstanding for Electrical and Acoustical Performance
Antec CP Series
Antec SG Series
Seasonic MD12 Series
Seasonic X Series
Outstanding for Electrical Performance
Corsair HX Series
Silverstone Zeus Series
Very Good Electrical Performance
Antec Earthwatts
Antec TP / TPQ Series (some are / some aren't)
Corsair TX
Corsair VX