HMDI Cabling

What do I lose if I don't purchase an upper end AudioQuest HDMI Cable? I am currently looking at AQ HDMI-X 3m ($99.00) vs. AQ HMDI-3 2m ($225.00).

I interested in getting the best quality from my system. Should I run from my HD cable box(no HDMI) DVI to HDMI (SONY 50") and then from DVD HMDI to HDTV? Then what about from the DVD (Denon 3910) to the B&K 501 Receiver, do I use component? When I purchased my equipment the dealer sold me cables of his choice (AQ YIQ-3 type component, AQ type 4 speakers, AQ Diamondback Sub, and finally AQ Optilink 1 from HD cable box to receiver). The speakers are straight forward its the DVD, HDTV and HD Cable box I inquiring the best decision for choice of cables.

I didn't know what I was purchasing and relying on salesmen to assist. Did I go wrong with the choice of cables?

I am a novice to this HT and wanting the quality as well. The decision maker of B&K AVR and my Velodyn DD sub was at Tweeters and I really enjoyed the smooth sound .

I appologize for being so descriptive but I feel its the only way the reader understands what I currently have to give me the best advice with what I am using.

Thank You
Al