Which of the two graphics camps is easier for setting up HDMI on your HDTV? I don't have HDTV yet, but I can say that the analog source via the S-Video output is definitively better on the ATi cards I've tried.

"When you connect a computer to your TV using a digital signal like HDMI, the process isn’t as seamless as connecting a dedicated piece of AV hardware, like a TV tuner or DVD player. This is because AV equipment makes automatic allowances for overscan whereas graphics cards don’t. To fix this, there’s a certain amount of manual tweaking required in the driver."