As a C1 owner I compared the S3 to the Nordost Heimdall and Frey's. I thought the S3's were equal in the high end. The S3's were a little laid back in the mids. But what made me decide on the Frey's were 2 fold. First the Nordost has a hair more detail/clarity which although at first listen seemed to be a 'thin' sounding cable. The longer I listened the more I heard more 'air' between the instruments and vocals which made for a better sound stage. Second the bass. Only when listening to deep kettle drums did the Nordost really shine. The S3's sounded more like a thump than a drum. I even took the cables to a friends system and heard the same thump. So that thump wasn't my electronics or room.
I was lucky to have both cables to demo in my home for 6 weeks. At first listen to both cables my gut reaction was the S3's were better. It wasn't until I heard the kettle drums did I finally make up my mind.
As far as the Purist Audio I will admit I have never heard them. But as Opus88 mentioned the cable company has a nice loaner program. That will give you the opportunity to hear them in your home on your system without a salesman.
Just another option and my opinion
I was lucky to have both cables to demo in my home for 6 weeks. At first listen to both cables my gut reaction was the S3's were better. It wasn't until I heard the kettle drums did I finally make up my mind.
As far as the Purist Audio I will admit I have never heard them. But as Opus88 mentioned the cable company has a nice loaner program. That will give you the opportunity to hear them in your home on your system without a salesman.
Just another option and my opinion