Cheapest but good cables….

You might consider Vogue Audio speaker cables. A bargain for what they are. I was attracted to the silver composition and their rather outrageous willingness to publish specs which almost no one will or, as I understand it, can. To my ear, they are detailed and quite dimensional; you may be able to follow secondary melodic lines that you couldn’t pick out before. If there is a specific weakness, the bass might be described as “polite” although I would be more inclined to use the term “refined”. Best wishes; if you could try everything available ( and I would love to help you) you could fill up a warehouse. 

I have had great results with Canare 4S11 speaker cables and Belden 8428 or 8402 interconnects.

Mogami lead VERY helpful, giving them a shot at the great price celtic66 shared here.

Another vote for Audio Envy. Only used their power cables, P2 and M3, but they are very flexible and sound fantastic. In my case, they beat $1k power cables that are just gathering dust now and need to be sold.

SVS has some good quality to price ratio cables. Their Soundpath Ultra gives a good bang for the buck. As usual it all comes down to how much you want to spend.  Cheap but good interconnect cables are made by Worlds Best Cable using Canare or Mogami cables and Amphenol interconnects. They are grounded on one side only so they have a certain way to be connected (comes with an arrow on a cloth tuff on each side showing the way the signal goes).