400 bucks extra for higher rated SMPS is OK IMO. GFX is bit pricy, but that's an OCed card.
Pricing of 7770 is good and can be considered.
AnandTech - Bench - GPU12
the main purpose of my upgrade is to play battlefield 3 ,MW3, crysis , metro 2033 farcry 2, Cod series mainly fps not to mention gta iv , mafia 2 & portal 2 (occasionally)
not really a fan of dirt 3, skyrim or civilization series .
now from the above comparison the 7770 lags behind the 6850 when it comes to some of the games that i intend to play like battlefield 3 , metro 2033 etc
now my question is is the increased price tag justifiable when it comes to the games i play , also like you said earlier it is also an overclocked card.
or is the 7770 a more sensible option.
regarding the smps i think i will stick with my current choice as i plan to do some overclocking (hopefully)...