He's something funny.
When I was shopping for my DLP at Best Buy the sales guy went on and on about the big thick Monster HDMI cable, and how you must have it, or the digital signal will look terrible.
I then showed him that the HDMI cable they had plugged into their own 61 inch DLP in their store was a skimpy looking thing and not a Monster cable, but somehow produced a perfect picture. He then muttered something about looking into the matter.
Their own skinny HDMI cable looked alot like the HDMI cable I got on Ebay for 99 cents plus delivery, and it works perfectly.
If it's digital, it either works or it doesn't. Dont buy expensive digital cables.