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My only suggestion would be to upgrade your power supply to min 700W.  It will run cooler and and your fan motors will last longer. Never stress your system with a border line power supply.  You will also need it if you decide to go with 2 video cards and CrossFireX Technology.

The 7770 video card is faster.............. My 2 cents

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Noted on the psu KH.  As far as the vid cards.. i printed out both of their stat sheets and compared them line for line.. the performance difference between the 2 did not seem to justify the extra 30 bucks.  I'll have to check it over again.  Still have to pay bills and am squeaking in the cash to build this box; so, trying to conserve wherever I can.  May even go down to 8 gigs of ram over 16.