XFX TS 550 $26 after $25 rebate
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013
I own 4 of these and have 3 of them in my desktops.
I have a CX430 but Corsair has a 1 PSU per product line per year rule on their power supply rebates so I have 4 XFX TS 550's since I know that they are reliable and multiple rebates per year but it is limited to 1 PSU rebate per household per promotional period.
To me there is no difference between a Corsair CX and a XFX TS since I don't overclock anything but for people who overclock they are better off going with a XFX. I just can't wait till next year to be eligible for another rebate.
It all comes down to 3 year warranty of a Corsair CX and 5 year warranty of the XFX TS since they were made by different people (Channel Well for Corsair CX and Seasonic for XFX)
It is a just a quality difference in terms of production and capacitors used. However it is a great thing that Corsair has the CX line and EVGA has Bronze line (ex. 500B, 600B) so that unsuspecting power supplies buyers will still get a better power supply than if they were to buy from other brands at the lower starting price point.