where are you located and what is your budget ($) for the graphics upgrade.?
I was only going to upgrade to the GT 430 because it is an on-hand product. I'm United States location. My thoughts were leaning towards the 9600 GT being a better choice based primarilly on:
Texture Fill Rate (20.8 billion/sec -vs- 5.6 billion/sec)
Memory Bandwith (57.6 GB/sec -vs- 25.6 GB/sec)
Shader Clock (1625 MHz -vs- 1400 MHz)
Memory Clock (900/1800 MHz -vs- 1600MHz)
The GT 430 has some nice, newer features as far as DirectX, Cuda Cores (96 -vs- 64), and a bumped up Core Clock (700 MHz -vs- 650 MHz) but they hardly seemed to bring it ahead in my mind...still always best to ask some other people who are probably more knowledgeable on such specifics so thank you for assisting!