for the prices of cor2duos, which are 2 geneations old now, you can get a more modern and faster intel quad. 9800 GTX are also rarer than hens teeth now.
I'd suggest something like my own build as a good budget game PC:
4 GB of DDR3-1333 RAM
500 GB hard drive
GTX 460 if you want nvidia, HD 6850 if you want AMD\
a 450-550W 80+ Bronze PSU from Antec, Corsair, XFX, Silverstone, Seasonic
a case to your choice
a cheap DVD burner.
This should run about $600 US, and something similar in India translated to Rupees