I've been using the Silver Serpent digital coax from BetterCables.com for more than a year, and have been very pleased with it. The Silver Serpent is a true 75-ohm cable (VERY important) and has excellent build quality, and it's hard to beat for $80. If you are not familiar with BetterCables.com, I urge you to take a look at their product line. Here's the link to their Web site:
http://www.bettercables.com/
http://www.bettercables.com/