Actually, looking it up, the 7500 was actually at the high end of its time so you may actually have enough memory on it to run fairly well once things are going at 32-bit color depth. I was kind of thinking more of the 7000 which is more just really at the bare minimum end.

But still, the chip that drives it was part of the first generation of Radeon chips, which are now currently in the 6th generation (http://en.wikipedia.org/wiki/Radeon). Something sort of more around the 3rd generation level is generally better to keep things moving smoothly when you start to have somewhat more complex stuff.

- Michael