ATi's rage theatre chip is the nicest TV-out chip. (Used in the Rage128 Pro cards and the Radeon Vivo retail, and of course the All-in-wonders)
But if you want it specifically for DVD playing on your TV, like Windogg said, pick up a cheap DVD player.
The Rage theatre chip is nice, and I got the 64MB Retail Radeon so that I could use TV-out when I wanted it...but really getting TV-out by itself isn't a good reason for getting a video card. I think you could find a better way to get DVDs on your TV.