Wireless Keyboard Mouse... (long range)

Hi,

I have my HDTV 3D TV connected to my PC as the third display and I would like to be able to play certain games on it... both cause it's a larger screen in front of my couch and because I have the option of playing the games in 3D.

However. My current wireless keyboard and mouse doesn't have enough range to work that far from my PC. So I was wondering what my options were.

Is there bluetooth wireless keyboard and mouse that would work well? Some other wireless standard i'm not thinking of? Is there a wireless USB adapter with better range? Is there perhaps just a long USB extension chord?

Which might be my best option?

Thanks!