A great interconnect between Soulution 751 and 725

In no order

audio sensibility - reasonablly priced

zen waive - great

cardas - great example of you get what you pay for

On my B system I got speaker cables from Kinki studio Wow! Who would have thought

Buy used

Spend your money on more music instead of things that make no objective difference. That's what I suggest to you. 

Buy high end used. AudioQuest Wel balanced for example. They were top of the line 5 years ago and are now priced at a 75% discount from original prices. In my opinion, it is hard to go too wrong. 

Albert Porter uses Purest. Give him a call or contact at Porterhouse Audio. 

Your products certainly deserve top-tier signal cables.  There are plenty of excellent options, as suggested above.  From my own experience, and thus my recommendation, is the new Audioquest Mythical Creatures series.  I had Audioquest Earth signal cables (no slouch as a signal cable) and upgraded to the new Thunderbird cable.  I found an immediate upgrade in quality of musical presentation.  However, I waited for several weeks of run-in time on the cables, then switched back to the Earth cables, making certain about what I was hearing.  I definitely could tell the difference and they didn't stay there for very long.  Switching back to the Thunderbird delivered on SQ, once again.  You can find many reviews on these new cables, providing far better description than mine.  All of them are overwhelmingly positive.  Best to you on your journey.