OP if you have budgeted for a 770 lightning you can get a HD 7970 lightning for the same price. 1150 mhz out of the box . 3GB VRAM. 3 free games with a chance that BF4 might be included in the list of free games in Oct. so wait till Oct to redeem the game coupons
also the HIS HD 7970 iceq x2 Ghz is a good option. 1050 mhz out of the box. dual 8 pin power connectors. more power phases than ref HD 7970. unlocked voltage. good cooler. eaisly overclocks to 1150 - 1200 mhz with a bit of voltage tweaking. make sure your case can fit the card as its 311 mm long.
for value for money the HIS hd 7970 iceq x2 for USD 300 cannot be beaten. so think and decide.