Well, I don't really have much input on other projectors, however, check out projectorcentral.com as they have great reviews and recomendations.
I've had the Z2 for over 3 years and it has been great. In fact, I'm typing on my 130" screen right now, while I'm listening to a little Stevie Ray Vaughan on my Axioms.
There are some other Z2, Z3, Z4, and Z5 owners around these parts, so they may chime in...you can check out my website below of some pictures. Here is a pick of Star Wars at 130" with my cheap digital camera.
