Does anyone here have any experience with this?

Ideally I'm looking to capture 1280x720 video and screenshots.

How good does my system need to be to capture and edit HD footage, do I need Quad-Core, 4GB of RAM and a 1TB RAID or can I get by with less?


Also what capture card would you recommend, I've only really found 2 candidates for this so far:

BlackMagic:
Blackmagic Design Intensity Pro Card (BMD-BINTSPRO)
My new HD capture card - Xbox Live's Major Nelson

Epiphan:
Epiphan Systems | Products | Frame grabbers | VGA2USB
Epiphan VGA2USB Review


The Blackmagic has the bonus of being able to capture footage at full 1080p, but it is highly dependant on the system.

The Epiphan is external and USB based, which is a bonus. It can capture video easily at 640x480 but has a tough time at higher resolutions and has issues with motion for framecaps.