I disagree. All professional video capture cards for PC's make use of the PCI slot. Whether or not AGP is faster makes absolutely no difference, because the PCI slot provides sufficient bandwidth. A video card with VIVO is often crippled in terms of drivers because the company producing them is primarily a video card company, not a capture card company. I find this is especially the case with nVidia based video cards.
Anything using a PCI slot will be slower than a AGP cardwith video in built in (no pun).
Look for a card with VIVO. Price is about the same and it's faster.