I have a similar system as yours (just a step lower) and did the change from Ref xl to Opus throughout the system. The speaker cable change from Ref 160 to original Alexx speakers was substantial and the most costly. The biggest bang for the buck change for me was the xlr interconnect between my Rossini and Ref 10 line stage. The improvement here was substantial. The next biggest bang for buck was xlr interconnect between line stage and amp. For whatever reason, I wasn't wowed by the xlr interconnect change from the ref 3 phono stage to the ref 10 line stage. I am sure your dealer can arrange a demo of the cables for you, just be warned that the home demo of the Opus cables was a slippery slope and will make it hard to go back to the XL cables.
Transparrent Ref XL vs Opus
I currently have Transparrent XL throughout my system and I am thinking about upgrading the speaker cables only to Transparrent Opus. Has anyone mixed cables like this upgrading only the speaker cables and leaving everything else intact? Any comments on Ref XL vs Opus?
System: Audio Research Ref 10 Line-Stage, Ref 10 Phono, VPI Titan Turntable, DCS Vivaldi Stack, DAgostino M400 Monoblocks, Wilson Alexx V speakers.