ATI makes very nice cards, so don't believe anybody who says different.
Nvidia has the lead in two areas: drivers and heat/power consuption. In other words, they work wonders with their drivers, and they release them much faster than ATI. Also, their current manufacturing process allows them to release cards that consume less power, and therefore run cooler. Beyond that it's a wash; both ATI and Nvidia make a great product.
One thing that would be nice to know -- what screen resolution do you like to use? If you're looking to max everything at 1600x1200, that's a very different story than if you're looking to rock out at 800x600.
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