I'm very happy using the DNM HFTN Solid Core IC's $498.00 a 1 meter pair. DNM has made the same cable for some 30ish years and about 3 years ago did a redesign and added the High Frequency Termination Network (HFTN). Exactly what the HFTN does is a mystery to me, but everything became more clear and natural sounding. It's like not having a cable at all. There is a lot of information on the DNM site. Use the link and read about the HFTN and look around the site to find how they make the Solid Core wire.
http://www.dnm.co.uk/hftns.html#SpeakerHFTNs
http://www.simplifiaudio.com/online_store/dspeaker_store.html
Scroll down the page to find the HFTN Cables.
http://www.dnm.co.uk/hftns.html#SpeakerHFTNs
http://www.simplifiaudio.com/online_store/dspeaker_store.html
Scroll down the page to find the HFTN Cables.