[Solved] Which PSU I should buy? please help!

Hi, soon I am going to build following rig, and I am not quite sure which PSU to buy...here is my configuration:
2500k
mobo8Z68 V LE
hdd:1tb
Seagate barracuda
dvd rw drive
graphics card:gtx560 ti or 6770....

I calculated my required wattage at newegg and it comes out to be 505w. Please guide me to correct psu wattage and brand. I have cooler master and corsair available here. Also, what is meant by gold certified or bronze certified?

Gold and bronze is how effienct they are at converting the incoming electrical to what the computer needs.

Unless you plan on SLI'ing two 560Ti's down the road a corsair 500w range unit will work great; like the cx500 or the gs600

Power supply certifications: http://www.hardwaresecrets.com/art [...] tion/742/3

XFX 550 watt PSU - built by Seasonic.
http://www.newegg.com/Product/Prod [...] 6817207013

I too thought like that before making my choice. I was planning on p8z68 v gen 3, but it gets expensive here in India. Also, there are no gigabyte service centers nearby which may help if my mobo is defective. Newegg don't ship to India too.
BTW, is there any other reason without Bluetooth, more phases, extra Ports that I should worry about this mobo? let me know your opinion..

Out of gs600 and cx600, which ones is better?

hellfire is correct, only the CM silent pro's are good models.

and the cx600 is much better than the gs600.

for your build, the cx600 will be the best option, imo

I'm curious as to how you came to this conclusion.

Ah, the old Seasonic is better than CWT trick, I agree
Here's the problem, the only CX that was a Seasonic inside was the 400 and they discontinued that one

CWT

In the CX line, only the now-discontinued CMPSU-400CX was made by Seasonic. The rest of the CX and GS line of PSUs are made by CWT.

Thanks for that one. I didn't knew that site...kinda cool. From above discussion,I feel like I should ditch cx600.
I am Confused in seasonic620w and gs 600 now.

Best answer selected by mmost.