The only one I can recommend from personal experience is the FWB Nubus Jackhammer. It worked fine both internally and externally with my 840av (as well as my 950 and 9150 PPC). I used it in the 840av with an external FBW drive array and imported video from my vcr onto the array. I would then move the drive array over to my G3 to change compression and edit it in QT Pro.
Separately, the Jackhammer is probably the easiest to find in working condition on the used market, and Rorke Data Systems still has the drivers available for download.
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