Help me pick my screen

[funkyshooters]

Hi all. I am looking to rebuild my theater with a projector and screen. My basement is perfect for it. The wall I want to put the screen on is 134" and I have chosen to maximize my screen and go with a 120"'er my question is what do I choose for a screen gain?

Let me lay out my config and my thoughts on the research that I have done.

I am going to go with the Epson 6500UB Projector. Throw distance will be around 13'. I have complete control over the lights. Using a lutron remote dimmer. I also have blacked out the windows with thick black curtains when movie watching. I plan to go with an electric tabbed tension screen. The reason for this is that I have a window that is on the wall that the screen is going on preventing me from mounting a fixed screen. The window is darked out and covered so it is a non-light factor, but will prevent the fixed screen. My walls are a chocolate brown. But I may do some black behind the screen, and the ceilings are white.

According to projector central calc with a 1.1 gain screen that will give me an image brightness of 19fl. Is that good enough? Should I get a higher gain screen? Should I move the projector back?

Please give me any suggestion on screens, changing my setup, or whatever. Also good places to buy screens would be appreciated.

Thanks!