Pure Silver Wire

I've long found silver/gold combo cables to deliver on all fronts, presently using Zavfino Gold Rush and Mundorf silver/gold cables in my system. Gold tends to just slightly mellow the silver, very unique voicing.

Audio Magic makes some really amazing cables which are not the least bit harsh once they are broken in. I had their top-of-the-line power cable that I tried in my home theater room to power my 4K projector and (wonder of wonders) it improved the picture quality measurably. In the projector wars, there's a lot that is made out of small incremental improvements and here is a cable that makes as much improvement as spending a few thousand more for the next model up. 

Silver 'done right' will improve the perceived transient speed in an audio system as well. 

I've been using DH Labs T-14 speaker cables for several years. I find the sound to be a "subjective improvement" over the 12g copper cables I used before. I'm very satisfied, so no plans to further experiment with speaker cables.

DH Silver Sonic

I use primarily siltech, which are comprise of silver/gold alloy.  Fantastic cables, not at all harsh and bright but very smooth and revealing.