Sapphire HD 7770 @Rs 8000 will be best at this price range. You will not be able to max out graphics settings but on medium u should be fine. BF4 and Crysis may run on lower settings @ 1080p. At 1366*768 you may be able to max out about everything. Also if you dont have a good branded PSU, get one with 500W because PSU directly influences the card performance.