Do you have the/a camcorder to play the tapes in? If so, does it have a firewire connection, or RCA connections? Are these camcorder tapes that can be inserted into a VHS adapter, and played in a VCR? If so, you would be better off getting a dvd recorder, and transferring the tapes from vhs to a dvd.
If you still want to look into a usb device, look at the ADS devices. (www.adstech.com). Some people also like the Plextor device.