You could do what you want to do with any DV camera... personally, my family has a family-geared Sony camcorder:
It has the option to record to Digital8 tape from sVideo or rca. I'm sure Sony's not the only one who makes DV cameras that can do this - probably almost any DV camera can do this. If I was doing what you're trying to do, I'd just setup the camera to record from the sVideo input onto D8 tape then just hit the rewind button and record the input like normal (Premeire, Sony generic software, Windows MovieMaker - capturing through Firewire is common nowadays).