I replaced my QED SW1 cable with the cable below for about £38 and the performance of my REL Strata II was instantly noticable; an absolute bargain.
Wireworld The Solstice 5 Micro
Mark Grant for custom length (uses good quality components). I use a QED myself. If you're on a budget, stick with Profigold or Fisual. Both are good quality for the money, which would suit kit of this level.