The natural progression of the DMR-EH68, it has twin HD tuners where as the EH68 doesn't have any digital tuners which is a major drawback in this day and age.
The ultimate though will be the Blu-Ray DMR-BW850GZK
TVNZ 1 and 2 reception is usually dodgy in my location, sometimes 2 is so bad the EH68 just gives up and shows a grey blank screen.
Although the tuner does pick up Juice and Triangle quite well where as the TH-42PV700AZ doesn't.
The other bonus is that the machine is networked Viera Cast (you can access live Internet content including YouTube and Picasa ), I haven't played with one so don't know how usable and practical this feature is; i.e Can you copy files from your local area network?
Taken from the Panasonic site
Features Overview
Share, play and keep all your high definition content with Panasonic’s DMR-XW350 – the first HD DVD Recorder available in New Zealand. It features twin Freeview HD Digital Tuners to record two channels at once.