ok, it won't matter, cuz he's running a 1.3 celeron with PC133 RAM... desiboi... go with whatever is cheaper, your system will get maxed out before either vid. card....
The Mad Dog FX 5500 sucks. Horribly. Fan is extremely noisy. Unless you plan on replacing the fan with an aftermarket, do not get the Mad Dog brand card.
The 9600SE is utter garbage. It is neutered to 64 bit bus width. It is worse than the 9500 and just a little better than the 9250.
The 5500 isn't great either. The 5xxx series DX9 support is horrendous unless you have a 5900 Ultra.
You might have problems running GTA: SA on medium. I have seen people with 9600XT set it to low and drawing distance to default. Quite surprising actually. Some say it's a bug because there is basically no difference high, medium, and low.
But I would buy a 5500 over a 9600SE. If you can find a 9550 PCI or 9600 PCI that would be a better solution.