The stock video card in a Digital Audio is a Rage 128 which should have a VGA port and an ADC port. If you have an ADC->DVI adapter (such as the one made by Belkin) and a DVI->HDMI cable to connect to your TV, it should work fine. The Rage 128 can drive 1920x1200 (according to everymac.com). That's a lot of pixels!

Regardless of the video card you choose, I think your best bet is to avoid VGA connections and try to go all digital if at all possible.

Peace,

Drew