I think any newer video card that has DVI connector would suffice, as long as you're not using said DVI already for your PC monitor. I do not know if there are any affordable PC video cards that offer two DVI-out connectors.
For example, my Ati 9800 has one VGA, one DVI and one S-video connector. I am already using the DVI for my monitor, so I'm facing this same problem. I'll probably end up swapping the DVI cables every time I want to display something from my PC on my new TV (a movie or something). Alternatively, I'll try using S-video, but from what I've seen my video card doesn't have the greatest S-video output.
As you probably already know, HDTVs have HDMI connector which is physically different from DVI, but it's essentially the same signal. You can (well, must) buy a DVI -> HDMI dongle that you plug in to your TV, and then use the regular DVI cable (I already have one, it came with my LCD PC monitor)
The thing I'm not 100% clear about myself is what output resolution the PC should be set to display the optimal picture on direct view HDTVs. Is it 1280x720? is it 720x480? is it 1900x1800? I have no idea... I know however that if you have Ati card, like I do, you should get the latest drivers from Ati, because they apparently have improved support for HDTV output. Also, I've seen people suggesting PowerStip software as a handy tool for experimenting with various standard, and non-standard resolutions.
If you use a "TV friendly" video card like the nVidia 6600GT, you don't really need to worry about resolution and refresh rate settings. Just set the card's output to 720p, 1080i, etc and you're good to go.
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