Prices are low enough you just might want to buy a few generic cable options just to have them around.
I bought a LCD display for my PC, and found out it supports HDCP and connection to my cable box, IF, I have a HDMI to DVI cable. Take a look in Best Buy or Compusa, the prices are freaking INSANE, like $90 for 10 ft cable. I had to pay $23 at Fry's or wait to watch HD on my new LCD for a weekend and a few days on a $6 monoprice cable.