If you are do any serious gaming on it then get the best ATI card you can
afford with tv-out. If you're not going do serious gaming then get a
9200se. If you want all the bells & whistles get an All in Wonder. If you
have an HDTV, wait a little while because none of the current cards have
native support for HDTV.
If all you're going to do is watch stuff on your TV, you could probably get
away with on-board VGA. But I would go for a decent processor and a fair
amount of RAM so if you want to record in high-quality formats (for DVD
authoring perhaps) your processor can keep up.