Not that it's an issue here, but I don't think the card supports AGP 2X at 3.3V. There is another AGP 2X type of slot that runs at 1.5V, which is what the spec supports. As far as I know, the card only supports 0.8V and 1.5V. But again, that doesn't really matter at this point - just wanted to clarify for anyone who might search this thread.
greymortis,
The 9600XT is not absolutely necessary, but would easily outperform the Ti4200 in most benchmarks. Plus, it's DirectX 9.1 certified, which the Ti4200 isn't. It's definitely a step up from what you have, but the money might be better spent towards building a newer system altogether in the near future. You don't want to go too high in the Video region, otherwise other components like your hard drive, RAM, and CPU start to bog down the card's potential.
~cdogg
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