Now I'm curious to what kind of setup uses a couch. Do you just have wireless peripherals?
Basically the same as sitting on the couch to play a console. I made a nice little table out of wood to put my keyboard and mouse on and use a 46 inch TV as my monitor. I used to have a laptop cart for that but the stupid thing broken like everything made out of particle board, so I just made one instead for like 1/3rd the price. I used to be primarily a console gamer and that was my favourite things about console gaming, I didn't like gaming on a 20-something inch tiny monitor.
So I just bought a big TV and ran an HDMI cable from the PC to the TV... simple. Everything is wired still. I still use a wired 360 controller for a lot of games because I just find it more comfortable, but the days of sitting here playing awful-looking games while my 360 makes a shitload of noise ended years ago. That thing was seriously loud...