FYI many newer video cards are VO (Video out) so they support HD resolutions and some include composite, S-Video, and component out.
It all depend on what you really want to do in the end. There are other methods to get video on to the PC.
Most newer camcorders with a firewire output transfer directly to the PC without VIVO. Many of these camcorders also allow you to connect a VCR etc to the camcorder and pass the video through them to the PC via the firewire.
If you get a TV tuner card, most support some type of Video In. If you want higher quality video in there are a range of higher end Video In converters from companies like Canopus.
Most VIVO, TV tuners, and cheaper Video In cards use the conextant (sp) chip if I remember correctly. There are two mass produced chips for video conversion, with contextant being the most common. Their quality is rated as good, but the results can range from good to poor depending on how they are incorporated. ATI also makes some video conversion chips and boards that are considered good as well. Some people have complained that they don't play nice with nVidia video cards.
One big benefit to a VIVO card can be the included software. It might include some PVR or editing software. Even if it is an older version, it might meet your needs or save you money to upgrade to the latest version (compared to the cost to add VIVO or another card) vs. buying the software out right.
If you think VIVO will be important, read some reviews on the card and find out what Video In chipset it uses, and read some reviews on that.