hmmm...we have really strayed away from the OT guys....
anyways, now that you have a CM Extreme 600W PSU, its ok, not too bad, I owned it for some 2 years, no biggie, just remember that it is actually a 400W PSU and not 600W, so plan your upgrades accordingly.
Before people start bashing me for the above : yes, a VX450 is a far better option, but don't make the poor guy feel bad about his purchase.
@abhidev : If you are low on $$, even a Seasonic Bronze S12II 380W (Rs2.5k) or the 430W(some 3k?) would easily handle a 5770.
As for the PSU discussion before, as asigh correctly stated before, if you load up a cheap quality PSU , it may produce significant ripples that could very easily damage your hardware.
When the PSU is loaded beyond 50%, its efficiency starts falling and the PSU starts heating up, so its wise to plan a new rig with a good PSU which will be good enough for future upgrades.
Anyways, here is a small guide on PSUs : PSU buying guide