The Flyboy HD with 960 x 245 LCD
If you're ready to take your HD with you, would like to actually view a few of the included pixels in transit, and never really cared much for vertical lines of resolution, the Flyboy HD is the PVP for you. It has a 960 x 234 LCD with an LED backlight, a 20GB hard drive, and can even support an MPEG-4 camcorder add-on. There don't seem to be HD output capabilities, but you can record and play SD videos with the included AV ports, or if you're into toting around a large screen video player for audio reasons, you can record to built-in mic or pump out the tunes with built-in speakers. Video Without Boundaries will be showing this off at CES, and should be debuting it early next year for $400.
