I already have a stand-alone DVD - I'm just interested in how general windows usage fairs with these cards - I've looked around and been to the manufacturers site but there is no mention of what sort of resolution you can get through a TV.
Rather than try to output a pc to a tv set, why not buy a pc and monitor, and add a tv card so you can watch tv on the monitor. Picture quality of tv programmes is almost the same as on a tv (some degradation due to pc monitors being non-interlaced wheres tvs are interlaced) and the pic quality for general windows use will be much better.
Hmm. Too high a resolution from your TV card can look bad on a TV due to the TV not having enough resolution to display things correctly (e.g. Text will look blurry). Of course you get more real estate with a higher resolution so it's kind of a trade-off.
If quality of output is important (but the speed of the card isn't), consider a Matrox G series card for your pc with dual-head output (e.g. G200, G400). You could probably pick one up real cheap now and the quality is definitely a whole lot better than some of the newer cards. Independent resolutions for the twin outputs helps things tremendously... In fact, I still a G400 for my server.