Buying new Gaming PC for under 1000 dollars

i made this at hp.com is it any good?
Your HPE h8z series
Operating system Genuine Windows 7 Home Premium [64-bit]
Processor AMD Phenom(TM) II X6 1090T six-core processor [3.2GHz, 3MB L2 + 6MB L3 shared, up to 4000MHz]
Memory 9GB DDR3-1333MHz SDRAM [3 DIMMs]
Hard drive FREE UPGRADE! 1TB 7200 rpm SATA 3Gb/s hard drive from 750GB
Office software No additional office software
Security software Norton Internet Security(TM) 2011 - 15 month
Graphics card 3GB DDR3 NVIDIA GeForce GT 440 [DVI, HDMI, VGA]
Primary optical drive SuperMulti DVD Burner
Networking Wireless-N LAN card (1x1)
Productivity ports 15-in-1 memory card reader, 2 USB, audio
TV & entertainment experience No TV Tuner
Sound Card Integrated sound edit
Keyboard and Mouse HP wireless keyboard and wireless optical mouse



these are other graphics cards for it(within my price range) which is the best?
1GB DDR3 NVIDIA GeForce 405 [DVI, HDMI, VGA adapter]
-$100.00
1GB DDR3 AMD Radeon HD 6450 [DVI, HDMI. VGA adapter]
-$100.00
1GB DDR3 Radeon HD 6570 [DVI, HDMI. VGA adapter]
-$80.00
1GB DDR3 Radeon HD 6670 [DVI, HDMI, DP, VGA]
-$60.00
1.5GB DDR3 NVIDIA GeForce GT 440 [DVI, HDMI, VGA]
-$60.00
2GB DDR3 NVIDIA GeForce GT 530 [DVI, HDMI, VGA adapter]