Should I upgrade my speaker cables?

Look into Townshend Audio's F-1 Fractal speaker cables. They best most everything and they are reasonably priced. I have a pair that replaced my Straight Wire Crescendo's and the improvement was more than significant. Their Fractal interconnects are also fantastic. 

One set of Heimdells 2 is 4 meters, the other set is 3 meters,  that is what my dealer had available at the time, to be honest 2.5 meters is all I need.  I’m starting to hear It’s not a bad idea to to just keep the Heimdells, I found a gauge converter calculator and 18 strands of 22 gauge translates to 10 gauge all together 

Those fidelium cables caught my eye, what you guys think of them?

 I found a gauge converter calculator and 18 strands of 22 gauge translates to 10 gauge all together 

It is easy to remember that every 3 steps of gauge double the area.  In this case:
gauge 22 - 1 strand
gauge 19 - 2 strands
gauge 16 - 4 strands
gauge 13 - 8 strands
gauge 10 - 16 strands

In addition it is enough to remember that middle of the pack gauge 16 is about 4 mohm/ft.  According to double area rule gauge 13 will have 2 mohm/ft and gauge 10 will be 1 mohm/ft

If you have that kind of budget you can buy used TYR 2 or Valhalla 2 Speakers cable USED....