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You can try one with a built in repeater if you need longer than 16 ft.
Actually I may try this extension cable. It seems to have a signal repeater built in. I wonder if this would be better.
I found a 25 ft extension cable, and if needed link two of them together.
Possibly a USB cable extender? I know there are some 25 foot ones you can buy. If you have a wireless dongle for lets say a wireless xbox 360 controller, you could have it plugged into the USB extender and set it as close as possible while using the controller on the couch.
If this works for you, you can buy Controller Companion and using the PC on the couch would be made easy.