So given the choice between the NVIDIA fxgo 5650 128 or ATI 9600 pro turbo 128 you would opt for the NVIDIA?
Hell, no: not the 5650. I would go for the GF4 Go 4200 - but it's not available on the Inspiron anymore, however it can still be purchased as a spare part.
If you are going to have it replaced, definitely get the ATI. Not everyone has been having problems, but they are definitely there. No, by all means, go for the ATI it will be vastly superior.
Best of luck,
Who's General Failure and why's he reading my disk?