@qwerty_ashu It would pretty much be the same since both of them now uses 28nm design but I personally think that The GTX 650 consumes less power ( about 25%) since I had both cards. You may also check this link http://www.hwcompare.com/13467/geforce-gtx-650-vs-radeon-hd-7770/
Since I had the Sapphire HD 7770 a couple of months before and I know it just consumes more power, although it performs pretty well against the GTX 650 but not on a remarkable margin. like 1 or 2 fps ( you can't even tell the difference) . Anyway, I would lean towards GTX 650. ( about $120 ) Palit I think is available in India
With your Screen Resolution, you should be able to play most games at Max to medium settings with an average of 35fps or even more.