I like the Panasonic units because they allow for time-slip (watching one program while recording the other) on DVD-RAM disks. However I am wondering if any of the other stand-alone (no hard drive) units have this capability. I am assuming that any maker of DVD-recorder that has a hard drive also has this capability.

Do not answer with TiVo, Replay TV, or a cable or satellite provider's DVRs as a solution. Thanks!