In my media machine (can't really call it a HTPC, all it does is play fansubbed anime and the like) I have a Rage Fury. After a couple years, ATIs drivers became decent for it...and shortly thereafter ...
a tvtuner gets tv INTO your system, not out. What you will need is either a new video card with tv out, or an external vga->tv converter. I have both, i paid 170$ for the external box which can ...