Tried the iMac forums to no avail...thought I'd try here... In need of some solid advice. Here's my situation: I'd like to wire my iMac with my home theater system so that I can watch mkv's and other files on my hdtv. After measuring it out, I will need 30 feet of wiring (with room for slack) to go along the walls from iMac to home theater. I have found a number of HDMI cables in the 30 ft. length that I'm looking for that advertise to have consistent signal throughout the length of the cable, and I have found only one 30 ft. optical digital audio cable from a distributer that isn't very well known who also advertises to have consistent signal from end to end. Does anyone have experience in dealing with connections of these kinds at these lengths? Will I really get a consistent signal? If not, what are my other options? Also, to back track a bit -- is the optical audio cable the best thing to do? I'd assume to get a mini-adapter to fit it into the iMac's audio port. My receiver can accept a coaxial input as well as the optical. Thanks in advance.