I did look at those, but AFAICT they can't output uncompressed video (or even pipe it directly into say divx, xvid, or huffyuv). So to get into my preferred archive and "watching on the go off my laptop" format (which is xvid with high motion search precision and 2-pass to make sure the allocation is perfect) I'd have to capture into their lossy, encoded on the fly, mpeg2 at the maximum bitrate allowable and then convert.
I suppose I should email a rep or ask around to make sure there is no support for uncompressed, heh. Also maybe I'm being too picky and the maximum bitrate those cards could put out is sufficient to prevent the video from degrading much due to the enforced transcoding. Btw, in case you go with one of them and bother converting, one review mentioned to set the output to cbr instead of vbr to avoid sync issues when converting from it. Would be nasty to elimante one cause of desyncing by getting a card that can handle audio iteslf only to have more crop up there, heh.
Edit: The Canopus actually hardware captures to DV (just like the PVR250 hardware captures to MPEG). Just making sure that's clear in case someone comes across this later. The Canopus does about 13GB per hour, though, and DV is very editing oriented. The PVR250 on the other hand only manages about 5.6GB per hour at maximum bitrate and CBR settings. Direct capture to huffyuv (lossless)/uncompressed would be higher quality, but then you're back to risking dropped frames and audio sync again...