Avoid Raidmax and Ultra .... they are one of the few lines that are bad across the board. .... Most major brand make different units for different markets. For example:
This Antec Neo gets a 6.5 performance rating (read budget PSU)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=117
This Antec gets a 10.0 performance rating (read serious enthusiast PSU)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=142
In other words, if you concentrate solely on Brand, you may be disappointed. Here's some guidance
Antec SG / CP / HCP series - 1st tier
Antec EA / TP / TPQ series - 2nd Tier
Antec Basiq / Neo series - 3rd tier
Corsair AX / HX series - 1st tier
Corsair TX / CX series - 2nd tier
XFX Black Edition - 1st tier
XFX Core Edition - 2nd tier
Seasonic X Series - 1st tier
In the US, right now XFX is being very aggressive with their pricing and have the best deals about right now