My setup?
I'm running an Epson Home Cinema 3700 mounted on ceiling, about 3 meters away from a wall with an electric retracting screen. I don't know much about projectors, I'm not a a home theater guy. But what I do know, is that it has enough features to make a proper image, good colors, and, I can use it with all my bright lights on in the room without sacrificing image quality. It doesn't have any noticeable lag either, which is nice. I can play games on it if I want.
Then my computer is tucked into a nearby closet, and I am using wireless mouse (g903) and keyboard (g613) to have no clutter on my large marble desk. I picked these inputs because they have no lag, which helps a lot since my computer is a couple of meters away behind a closet door. The older shitty wireless mice I had couldn't handle the distance.
Then I use some wireless Sony XB950B1 headphones. Its nice because nothing has wires, and zero clutter. I can walk around the whole house and still get/control my music on the PC. Sometimes I get paranoid and use an Xbox controller to connect the headphones with an aux cable, because then the antenna for the input/sound is in the controller, and not near my head.
I need a new mouse pad though. The pad I have is meant to be plugged into a PC.
As far as seeing it, its a small-ish room, so getting a good image of it all is difficult.