gts250 is a renamed version of 9800gt,I don't recommend buying a gts250,when coming to 5750 and 4850,The 4850 will perform good,but the 5750has dx11,shader model5 and mainly less power consumption!and there is only a small difference between the 4850 and 5750
EDIT:I am also from india ,and at my place i am getting XFX HD5770 1GB DDR5 @10500RS (Only for gohan007)
You are wrong on just about everything you stated.
the GTS250 is a renamed 9800GTX+ that runs cooler and tends to be on a smaller board. Its a better card then the 9800GT ( a renamed 8800GT itself). The GTS 250 and 4850 run neck in neck in a lot of games and the GTS250 beats it in a lot of popular games. Your knowledge of graphic cards is lacking at best.