Ah Cables, cables cables....
For many years I was a big sceptic, just bought bog standard cables and thought all was well.
Then I was persuaded to listen to some performance tests with different cables, and suddenly my ears opened up. Yes there is a difference and it can be huge. So when I upgraded my system I opted for expensive cables for audio and video and the difference is massive. Sharper picture, less fuzzieness, less interference, better colour the list goes on, and the same is true for the sound.
Quick estimate on cost : Spent about £600 on cables for a full av setup, and its worth it.
I always use a simple comparison on cost btw, estimate the value for your software and ensure that the hardware costs less.
The best advice for you is o talk to a good local dealer and borrow cables for a week (they may ask for you to pay upfront with the option of returning them) and give them a whirl, ok dealers want be the lowest price, but if you want to get the best out of your system, having a good relationship with your dealer can help.
Tone