I was also going to recommend PC's website, Nick beat me to it...I have the Z2 (4yrs old or so) and over the air HD stuff looks amazing. Even standard DVD's over my HTPC at 720 resolution look amazing.
The contrast on the newer Z5 (720p) and Z2000(1080p) are like 10times better than my Z2. I guess we can't tell you if you will like a projected image over a LCD or Plasma, but for me it is all about having a movie theater in my home. We never go out to movies anymore, why would you, unless you can't wait until the DVD's come out.
I am going to wait until the Z2000 or other 1080p projectors come down some more before I get the bug.
