AM3 is future proof but AM2+ is VFM. As i know computer has a lifetime of 3 years, so it will be better to go with AM2+(Phenom 550 is best). But you can chose phenom x4(810) around that price. Still you can consider Phenom x3(720) will be better than 810.Why are you going with 4850, consider 4770. It consumes less power and much cooler than any of the main stream GPU both from ATI and nvida. Price of 4770 (512mb) will be arround 7000/- in mumbai and 4850(512mb) will be 6800/- in mumbai. Now the choice is yours.