Yes, get an HDMI cable. Get it from monoprice.com, don't go buy one of the re ed $100 Monster cables from Best Buy though.
Here's a ten foot cable:
http://www.monoprice.com/products/pr...seq=1&format=2
And a 6' cable:
http://www.monoprice.com/products/pr...seq=1&format=2
Dunno how long your run is, but they have longer cables there.
Also, depending on your audio system setup you'll want to get fiber connections between your receiver and the stereo if you want to max out your surround sound experience.