There is really no "ideal" match for a particular config. It depends on your budget, your needs and expectations. You can use just about any recent AGP card whether 4x or 8x (not PCI-E cards of course).
In the nVidia range, all video cards in the FX5000 series and 6000 series are DX9 compliant. In the ATI lineup DX9 compliance starts from the Radeon 9500 and X300 upwards.
Prices start from a little over 2k to over 20k. Your CPU is slow by today's standards, so even if you can afford to buy the high-end cards, their power will be largely wasted unless you plan to upgrade the rest of your system in the near future.
Suggestion : go for a low to mid-range card. We'll be able to make more specific suggestions if you state your approximate budget.
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