Hi, need a bit of advice from experts.

The layout of my room is like a right angle triangle, with the projector unit at the right angle,with the screen plus tv cable (Point B), and my computer at the other 2 points.

Me thinking of purchasing a projector, celling mounted, to connect to my computer, so i can play games on it. The spot for the projector is 3 meters away from my computer, and ill connect it using a long DVI cable.

Now, my wife will want to watch tv programs, independant of my computer status, so is there any sort of tuner box or something i can purchase, that i can place at Point B, so she can watch TV programs on the projector, by changing the input source of the projector? and what kind of cable do i have to run? can recommend some brands or something?

Also, am going to buy a wii, and will i be able to plug the wii to the TV tuner box?

Last, audio wise, I use earphones, so i dont wake her at night. now, what can i buy so that:
1) she can watch TV with sound
2) I can play games on projector with sound (input from computer)
3) She have TV sound, and i have computer sound on earphone at the same time?
any advice please?

Ideally, the solution does not involve physical setup everytime we change usage.

Appreciate all advice.