My budget gaming setup $620(PHP26400-phil. currency)

[Kentlinsan]

Specs :PROCESSOR : CORE I3 2100 @ 3.1GHZ

MOTHERBOARD : ECS H61H2-M2 B3 -

RAM : GENERIC 4GB DDR3 1333MHZ

VIDEO CARD : SAPPHIRE HD 7850

POWERSUPPLY : CORSAIR VX550W / HEC RAPTER II 600W

CASING : Aerocool (VS3 Advanced)

my budget is up to $620(26300 philippine peso-converted to usd)

3. I'll use it for gaming purposes, playing @max settings

4. 19" widescreen LED @1360x768 ; not planning to SLI/Xfire

5. I'm buying this June

6. I'll be overclocking.... overclocking my GPU only.

7. Where? oh i plan to buy in my country, philippines

8. No extra features, the build has it all.

Im planning to downgrade the Wattage of my psu to 430W-460W , will it be capable?

please recommend me some PSU manufacturers so I can base on them.

oh, and one more thing, I'm choosing among these 3 cards : GTX 560 ti, GTX 560 ti 448, HD 6950 and HD 7850 what do you recommend among these 3?

once again, im planning to MAX OUT all game settings to all games except for the AA or mybe the AF.