I have many hours of hands-on time with a Matrox RT-X100 based system.
With the RT-X100 card installed, you don't even need a super powerful PC because almost all you do is in freakin' Real Time because of the co-processors.
You need a boot drive that has Adobe Premiere Pro 1.5 installed
and an Audio-Video capture / editing drive. They recommend using a RAID 0 setup and that's what I've been using. Super smooth. When "scrubbing" the timeline, it is almost as smooth as using our older $30,000 Mac based Media-100 system. But as far as features go, I like this system much better.
You need dual monitors. Any video card with dual output that supports Direct-X 9 will be fine. We have some mediocre NVidia based card. Video speed is unimportant.
This allows me to capture great Analog video from composite or S-Video. Digital in on firewire is the best, though. Flawless control. Premiere lets you create a log-list of you In and Out points, then you can walk away while it does the actual captures.
PS. Matrox really recommends that you use Intel P4 or Xeons on an Intel motherboard. They give recommendations on their website.
At home, I run Adobe Premiere Pro 1.5 on my AMD-64 3000+ and it runs almost as well, but I don't have the Matrox RT-X100 so I can have some rendering time, but it is bearable because my computer is plenty fast.
any other specific questions?
JonB