It is quite true that everyone will have their own opinion on what's best - that's the beauty of having this forum to discuss it!
Kim did a nice job summing it up for you. Now that we know a little about your system (pretty fast CPU and RAM), there's no need to speculate.
First of all, you need to get a card that has "video in". The Sapphire ATI Radeon card only has video outputs. If you can give us a price range on what you're looking to spend, I may be able to make a few suggestions.
I have an old
ATI 64MB DDR Vivo which used the outdated Radeon 7200 graphics chip. For being as old as it is (3+ years), I'm able to capture video easily and at good quality on my P-III 800MHz PC. Just about any current ATI or Nvidia card out there that has video inputs will do. I wouldn't worry too much about the card, just as long as you know it has inputs and that your hard drive has plenty of space (video files can get quite large)!
Now keep in mind that adding effects to your captured video is the second step. This is where it can get time consuming. Rendering effects to a 5-minute clip can easily take half hour or more, depending on the type of effect and the speed of your PC. That's why there are professional cards out there like the Matrox one I mentioned earlier. Those kinds of cards can easily run you $500 or more, but render effects in real time. What does that mean to you? Well, a 5-minute rendering will take 5 minutes instead of a half hour or more - it's that simple.
If you've got the time and don't plan on doing a whole lot of video editing, then there's no need to buy a professional card. But these are the options you need to consider.
~cdogg
[tab]"
The secret to creativity is knowing how to hide your sources"
[tab][tab]- A. Einstein