The vid card won't factor into it much unless you are trying to view high def. If from a Blueray drive, then you will need the vid card and monitor to be HDCP compatible. The 8800GT should be fine for that.
One of the Hauppauge PVRs will be suitable for the TV card, the PVR150 is dirt cheap these days. The PVR350 has a better signal/chipset, and was recently on special at ncix for like $60. Going up from there will support HDTV to a limited extent (over air), but also (usually) means a better regular signal, and/or faster channel changes.
They come with schedualing software, but I have never been able to set that up with a Canadian TV listing service. I know there must be a way, I just haven't had the time or need to read up on it.
Using the Vista machine would be best, because it has MCE built into it. You can use MCE for all your schedualing, super easy and pretty slick. Never had a problem with that and Canadian channels, it seems to scan and pick things up well.
Burning captured TV shows to DVD is another problem I have run into. Without MCE, the software that comes with the units will not create or convert to DVD format. You end up with an MPG file, that will not play on most DVD players. It needs to be converted to some VOB crap that DVDs use. I have still not found a decent free software package that will do this. Everything I have looked at that seems good, only converts AVI to MPG/DivX/etc, or visa-versa. Since I am not using MCE on my HTPC, this has become quite frusterating. It is an enormous and complicated routine for me to burn a DVD that will play on my upstairs DVD/TV.
Another problem is trimming or editing the video, to cut out commercials or trim off 30 minutes of extra crap that got recorded after the show I wanted ended. The software that came with the PVR does not handle this, or is only a demo. I have yet to find a good free software package to do this, other than Windows Movie Maker -- bleh.
As you can see, while I am here to try and help answer your questions, I end up asking more of my own! It seems the more I learn, the less I know!
The good thing is, the TV tuner works great! No problems or complaints there, does what I need it to. The rest is mostly POST recording and eventually I will find software that will handle conversion, editing and burning.
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