I'd like to sell my Z1 and get a new projector. I was very happy with the unit and it gave 2 years of great performance. But I know there are far better products out now. I was looking at Z3's on eBay, but as of my last search today, there seems to be none on there? I found that strange. Z2's seem to go very cheap now too. Is the difference on the Z3 enough to spend an extra $400-$500? I don't want to spend a lot. What do you all think?