Look into QED, they are a British company that sell reasonably priced cables that improved the sound of my system. Qunex 1, 2, 3 or the Silver Spirals. I think the Qunex 2 are pretty good (I have them on my Denon 2200 multi, I also own the Silver Spirals, they are on my VPI Scout), all of these cables have won lots of awards. QED also makes bulk speaker cable so you can solder your own interconnects. As for other components Musical Fidelity Integrated, and Polk LSi15's I would not spend more on cable, my next upgrade is the Vandersteen 2cE's and the Graham Slee Mark V phono.
Good Luck.
Good Luck.