Some info on the PJ since we install this model. First the price is great and WELL below any dealer cost. I don't know of a better deal at the moment.
It is a little noisy. If placed in the back of the room and no one is sitting directly under it it won't bother most people. If you sit directly below it might be bothersome. Compared to any Panny it is louder.
Picture quality is outstanding. The PJ is very flexible in set up but needs to be inverted with a ceiling/wall mount for best results. Certainly not as flexible as the Panny mentioned above but the Panny's trade quality for flexibility. The lens in this alone probably costs more than the panny to make.
If critical viewing is your number one concern do not got over 100" screen. 92" recommended for up to 1.4 gain screens. In high contrast/ low power/ iris closed this PJ is not bright. In my professional opinion 92" is the ideal size for this PJ and also accounting for aging of the lamp. At 92" you get a phenomenal pciture if your watching with no ambient light. Want to watch with lights on? Open the iris to medium or high and switch the lamp high power. This makes this PJ very versatile.
Can you go with a bigger screen and just keep the PJ in its brighter modes? Certainly! It will still will give better PQ than just about anything in the under 2K range currently. For the videophile I'd recommend 92" but for others not as critical 106" would be OK. Definitely, less than 120" unless you have a 2.0 or higher gain screen. This will work with a HP screen if you aligh it with the top of the screen. Its longer throw helps make this possible to keep you in the viewing cone and get the benefit of the screen.
Lastly, this unit is big compared to anything in the under 2K range. So keep that in mind.
Hope this helps.