This is one of those questions that create the immediate response, What do you want to do with it?
If you wish to have a NTSC quality Digital VCR capability, you will want one of the AIW (All In Wonder) versions, since they have the TV tuner built in and support the GemStar TV Guide integration without a monthly fee (a Tivo kind of capability).
If you are only using an NTSC display (and not a VGA or better monitor) the Gemstar Guide will not be very usable since the Guide will not be readable at interlaced NTSC resolution, possibly S-Video would work.
If you are hooking to a TV (NTSC or S-Video) and to a computer monitor, or want Video capture in as well as an NTSC Tuner, then the AIW 8500DV would be my choice.
If you play lots of games, the 9700 series might be your best bet (or if you need Component Output and DVI output at the same time).
If you want your system to be very quiet, then one of the lower speed ATI cards, or one of the fanless ones might be of interest.
Hope this helps.