First of all, corsair and seasonic are not the only good brands. Silverstone, enermax, Antec, and XFX are all good too. So, you are wrong.
The next good quality 600w fully modular PSU on newegg is a silverstone and it's $115 with shipping. Thats still $35 more for literally nothing. The corsair only has a 24 pin and 4+4 pin CPU power thats non modular. What can possibly be better about the silverstone? Nothing, $35 down the toilet because the 24 pin and 8 pin can detach....WOOOT
Even if you want to consider the OCZ 650w a possibility, which is lower quality but not complete crap, it's still $105 with shipping and I certainly wouldn't take an OCZ over a silverstone for $10.
And FWIW, corsair is probably the best company when it comes to mail in rebates.
I swear everytime you want to make some kind of point it is utterly useless information.
What workstation doesn't use a 24 pin power and 4 or 8 pin CPU power? Those are the ONLY cables that are non modular on the corsair semi modular PSU.