Because no PC card has an ADC port, you have to get a Mac card. Also, most of ATI's retail cards don't come with ADC, the 9000 being an exception. Here's what you can get to upgrade from your GeForce 2MX:
GeForce 3, 4MX, or 4Ti
Radeon 7500 (not much of an upgrade), 9000
That's not much. Plus, the Mac editions of the GeForce 3 and Radeon 7500 are both expensive and rare. I think that out of those, the GeForce 4 Titanium is your best bet. That is really an awesome video card and it's not THAT much more expensive than the 9000. Mac Edition 9000s are not that cheap on eBay (hopefully the price comes down now that the $160 128MB version is out), so I think it's worth it to go to about $200 for the GeForce 4 Titanium. GeForce 4MXs aren't very good and they're also rare and somewhat expensive.
If you don't limit yourself to needing ADC, then there are many more options available. Flashed cards are usually okay and pretty cheap. Certain ATI retail cards are available in Mac versions but have no ADC, such as the Radeon 8500 and the Radeon 9800. In addition, the quite rare Radeon 9700 Pro that was available with the Mirrored Drive Door PowerMacs will only work in an MDD, and nothing else. Otherwise it would be a great option at under $300 for a very fast 128 MB card, but it's just not the case.
P.S. You can theoretically get a flashed card that has DVI and use the DVI port to connect a DVI to ADC adapter, but it's not worth it. If you're going to spend an extra $100 to connect your monitor, you may as well drop that extra $100 on a nice video card instead. Given that the GeForce 2MX sells for $120-$180 on eBay these days, you can upgrade to the 4 Titanium for fairly cheap.
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