The standard '10% Rule' might sound fine, but it vastly underrates the fundamental importance of the cabling in a Hi-Fi system. There's no point spending money on your hardware and then never hearing its full potential because the cables you use add distortion and lose information. Think about it in terms of the size of improvement you'll gain rather than what you might 'expect' to pay eg. if a £100 cable makes your £200 CD player sound better than a £500 CD player then that's excellent value for money by anyone's standards.
And remember, our 60 day Money Back Guarantee allows you to audition our cables in your own system at home, and confirm you are spending your money wisely!