Speaker Cable Upgrade... Advice Please

There are lots of suggestions but here is one more — I totally get why you went with Devialet. So, the thing I might add is that Devialet uses Crystal Cable in their product? Have you tried that? If you are moving to Europe, you will  find some good deals on preowned Crystal Cable at the higher end (maybe not the highest end, but down just from the top tier). Good luck. Have a listen to Prince singing Joni Mitchell's version of A Case of You. Sounds great on the Devialet. 

I would go back to the AR and ps audio dac. Cables will not make a cold sounding system sound like a tube system.

The Duelund wire is cheap enough to try...I’m very happy with it.  I find it more articulate, with better tone than the cards clear beyond and Nordost Valhalla...

I don't think you should spend "More" money on cables.  You may want different ones... but more expensive doesn't make a lot of difference IMO in sound quality.  There is definitely a point of diminishing return.  I would try a few different sets (like from cable company) and keep the ones you like best.  But don't just assume you have to spend $2k to $3k for speaker cables.  

I found myself in a facing the same situation a few years ago.  Having my audio equipment sitting to my right, I thus needed a long pair of speaker wires.  Specially for my left speaker.  Anyway I discovered a solutun that works for me.  I take a one foot pair of the top of the line MG Audio Design's top end speaker wires and attach them to my speakers.  Now between the MG Audio Design speaker wires and my amplifier I am using a total of 12 runs of Jenna Lab's 18 gage hook up wires.  That is 3 of them to each of the MG Audio Design wires-12 in total.. Presently I am using 6, 17 foot runs on my left speaker and 6, 10 foot runs for my right speaker.  Anyway it works.  As good as could be hoped for.  Simply the Jenna Labs 18 gage hook up wires are so pure that they allow my one foot pair of MG Audio Design wires to do their stuff.  This actually took me several years to create.  I began with a now 7 year old one foot pair of then Shunyata's top end speaker wires with a single run, 4 in all, of the Jenna Labs 18 gage hook up wires.  Next I substituted a one foot pair of the MG Audio Design speaker wires for the Shunata wires and noticed a definite improvement in audio reproduction.  Next I added 4 more of the Jenns Labs hook up wires, now 8 total and again noticed a futher improvement.  And lastly added a third run of 4 more Jenna Labs 18 gage hook up wires to the total, now 12 of them in all.  The final results are incrrdible.  Even though the MG Audio Design wires are silver based and the Jenna Labs hook up wires are of copper, they all work together perfectly.  I do not haave other top end, and very expensive, speaker wires to compare them to, but it is easy to realize that my present day speaker wire "solution" is most likely is about as good as it gets  reguardless of cost.  The total cost for this was about $1800 for the average of a 14.5 foot pair of speaker wires.  I used a Rega Osiris integrated amplifier for my wire experiments.  I have posted previously about my results with speaker wire development, but because I have no technical background in electronics, my observations are generally ignored.  All I can do is repeat that my speaker wire "solution" is most likely as good as it gets, but for a reasonable cost.  Oh yes, the little Jenna Labs wires are small and very sturdy, so that they can be placed underneath rugs with no degrading of audio reproduction.