Some Liteon models can be hacked to ignore macrovision - but you can always buy a separate box to remove the macrovision signal.
The DVD RAM format gives you great features like simultaneous record and playback (aka "chasing play"). Panasonic models have a good reputation.
New models now have features like HDMI output and MPEG-4 playback - I'd definitely recommend looking for these.
Try here:
http://www.videohelp.com/dvdrecorders