How do you decide how big to go with your screen?

[painted_klown]

Hello all.

I recently purchased my first projector. An Epson powerlight home cinema 720HD. Black levels aside, I really like this PJ a LOT. I must say that it has added more to the "fun factor" of my setup more than any other single purchase.

Since I do not yet have a screen I have been shooting it onto a sheet tacked to the wall and moving my "screen" around to different walls and rooms in the house (just playing with it a bit) to see what screen size seems to work well.

One thing that me and my GF both quickly realized is that there is no such thing as a screen that is too big.

This got me to thinking that I should measure the wall and just buy the biggest screen that will fit on it. Here is where I run into a dilema...if I do that, then I have an issue with speaker placement. The two main speakers (towers) would end up blocking the screen.

So, here is my question. How did you decide what size screen to install?