What PSU do I need buy?

[Meshes12]

Hi there. Recently my psu having problem. So I decided to buy new one. So I contact one of computer hardware sellers to ask for price and sent him a picture of my psu . He told me the price for the psu is around (malaysia ringgit)RM560. I told him it's kinda expensive and i asked for cheaper one,so he told me to buy 600w psu but I was using 750w.
I'm confused right now, I don't know which one to buy. Please do kindly explain to me which one is better and will be there any problem if I buy the 600w ? . Here my pc specs
Motherboard: Gigabyte GA-Z68XP-UD3P
RAM : Corsair 4gb x2 (8gb)
GPU: evga gtx570
PSU : strider gold evolution 750w 80plus gold
CPU: i7 2600k
Storage :2tb wd
Dvd rom
Normal keyboard/mouse
LED 24INCH

Thank you.

 

[QwerkyPengwen]

You can get by with the 600w. If you are over clocking you would benefit from higher wattage but otherwise the 600w is fine

 

[Darthutos]

it'll all depend on brand of power supply.
is the 600 w he's trying to sell to you branded seasonic, evga, or corsair? then it's good. If it's a no name like M0nSterPOWER, gaming edition or what have you, then it's a terrible deal.