Leadtek Winfast PVR 2000 - This works well and has only a slight reduction in picture quality but won't accept an NTSC signal! Doh!
I have both the MSI TV @nywhere Master and the Leadtek Winfast TV 2000 Expert. For NTSC, I found the MSI card to have a slight edge in video quality, but it was pretty close.
These might seem like "cheapish" cards compared to the All-In-Wonders, but it's because they're a stripped down version that does nothing but pass a video signal. $30-$50 is all you should expect to pay, and you would be hard pressed to find a better device that captures to AVI. The other options out there, while more expensive and perhaps better at what they do, capture only in MPEG.