Eugene, I am running a 133" Hi Power and my puny Z2 lights it up great in a dark room. A Z5 would certainly work out just fine.
Scott B, sorry about my last post. Upon rereading it, it came off far more harsh than it was intended. I was trying to be sarcastic. Sorry if it came off as insulting.
Eugene's question helps to make the point I was trying to make myself, which is this.
Some people are extremely picky about Audio and Video. They demand absolute perfection across the board. I mean, EXTREMELY picky. Well, that's their perogative. But my problem is that sometimes, these very same people will use their "expertise" to influence a person's buying choices. This is all well and good, and most certainly welcome, but in reality, the vast majority of people won't even notice the imperfections these experts point out. And even if they do notice them, they won't really care.
I think if Eugene gets a 120" screen for his Z5, he will be perfectly happy, even if it isn't a Hi-Gain screen. I would agree though, that a Hi Gain screen like the Hi Power would work great, and believe me, if he gets one, he will be dazzled by it. I mean, my Z2 and Hi Power has dazzled me for 2 years. All I have really wanted more from it is better contrast, which the Z5 certainly has.