Wireless HDMI (aka turning my gaming rig into a "Steam Box")

My gaming PC is across the room from my big screen TV but I'd like to use it with Steam's Big Picture mode and create a "Steam Box" out of it. Running a long HDMI cable is not an option.

I see a few different wireless HDMI devices on Amazon but before I throw a dart and pick one at random, does anyone have any experence or recommendations? Obviously as a gaming device I can't be dealing with any type of lag.

Thanks in advance!