Let me tel you my current config 
Intel Core 2 Quad Q8300 @ 2.5 GHz
Gigabyte GA-G41M-COMBO-GQ motherboard with G41 express chipset(integrated graphics)
kingston 2 GB RAM DDR3
500GB WD Hard Disk 54000RPM
BenQ LED Monitor-19" 1366x786 resolution
Samsung DVD RW
iball Keyboard and USB Optical Mouse
iball Cabinet with SMPS (250W very basic, was bundled with cabinet)
Creative speakers(very basic model, also having problems with it)
so far i've come up with a list of upgrades:
4600rs for graphic card Sapphire AMD/ATI Radeon HD 6670 1 GB DDR3 Graphics Card - Sapphire: Flipkart.com
900rs for PSU/SMPS above 400/450W, suggest a model please
2500rs for 4GB DDR3 RAM Corsair Vengeance DDR3 4 GB (1 x 4 GB) PC RAM (CMZ4GX3M1A1600C9) - Corsair: Flipkart.com
(Not sure if the ram will work with my motherboard)
1.5k for speakers suggest a speaker too
Guys, please advice me regarding the upgradation, since this is the 1st time i'm buying a graphic card

Intel Core 2 Quad Q8300 @ 2.5 GHz
Gigabyte GA-G41M-COMBO-GQ motherboard with G41 express chipset(integrated graphics)
kingston 2 GB RAM DDR3
500GB WD Hard Disk 54000RPM
BenQ LED Monitor-19" 1366x786 resolution
Samsung DVD RW
iball Keyboard and USB Optical Mouse
iball Cabinet with SMPS (250W very basic, was bundled with cabinet)
Creative speakers(very basic model, also having problems with it)
so far i've come up with a list of upgrades:
4600rs for graphic card Sapphire AMD/ATI Radeon HD 6670 1 GB DDR3 Graphics Card - Sapphire: Flipkart.com
900rs for PSU/SMPS above 400/450W, suggest a model please
2500rs for 4GB DDR3 RAM Corsair Vengeance DDR3 4 GB (1 x 4 GB) PC RAM (CMZ4GX3M1A1600C9) - Corsair: Flipkart.com
(Not sure if the ram will work with my motherboard)
1.5k for speakers suggest a speaker too
Guys, please advice me regarding the upgradation, since this is the 1st time i'm buying a graphic card
