^^ You hijacking others thread?
Buy Corsair VS450 @2.1K.
But word of caution: Don't even try to overclock anything in your system.
The best choice for 5770 would have been Corsair GS600 @4K. As you have tight budget and there is no other good PSU inside 2.5K. That's why I've suggested those two.
P.S. Avoid seasonic PSUs. Their availability will be in doubt in future, actually it already is. So, RMA in future might be an issue with them. I they were radially availible in the market, I would have suggested you Seasonic SII 520W @3.1K.