What is proposed above MAY be affected by the "quality of the used camcorder". Your tapes have their data stored as digital info. To use a stand-alone DVD recorder fed by Composite Video and stereo audio, your playback device (the used camcorder) will be converting the digital info back to analog and sending it to the recorder that way. This process also involves using a Composite Video feed between devices, and that is not the best quality, although pretty good.
I have a Sony DV tape camcorder that uses a similar system for recording. It has an IEEE 1394a port (aka Firewire 400) that you can connect to a computer's IEEE 1394a input port IF you have one. Then you can copy the actual DIGITAL data on the tapes directly into your...