Ummm...how about Zu Audio cable.
I found the LIBTEC from Zu the most natural match... did not like the Ibis as much, its a bit harder sounding, libtec seems a little more organic feeling. basically I think internally they use the same cable, so trying other manufactures could be fun but you will still be feeding Zu cables internally in the end anyway.
NO WAX!!! It was like a basic sounding Monster cable to me.. No offense, but it is not in the same league as the libtec up in my opinion,I bought the WAX first too, and totally was like a very basic sound that I could get out of most wire laying around the house.. Maybe for other speakers it would be good but the Libtech is far better synergy with the definitions. I understand the price difference is an issue but Get a good 10 gauge copper stranded roll from Home depot and you will be fine or go all the way to the Libtec's honestly...
By the Way just to qualify my statement, I have owned Kimber, Audioquest, XLO stuff all in the 500-1000.00 range, however not on the definitions, and I would say my results with the libtec's are at least what I would get with any of those on my previous speakers and possibly beyond.. For the record I think the main thing that bugs me about the WAX and IBIS is the Supertweeter sounds a little more like a Supertweeter where the Libtec just seems to never let it get out of control, totally smooth at very high volumes, just more natural to the speakers voicing, of course in my opinion and my short but rather decent auditioning.