Upgrade? Luxman M-900u and C-900u from Pass X250.8 - Simaudio Evolution P-8

I have owned the c-900 and m-900 combo and they are utterly refined. I had them paired with Vivid Giya 2s. The top end and overall airy and liquid neutrality is beyond worth the price of entry.  If you do get them, I highly recommend the two lesser known cables I discovered after long trial of many brands.... a very pricey Echole Omnia cable for the C-900u (I swear it doubled it’s already formidable performance in every positive aspect with zero drawbacks) and for the m-900u a very affordable orange Luna Cable (the Echole cable that worked so well on the pre, didn’t work at all on the m-900u, nor did any other top flight PCs from other major brands such as Nordost, Transparent, Audioquest. All these cables improved some quality while destroying others.Then along came the humble Luna cable that left everything in its right place and just added  a slight up tick in organic flow and clarity. Subtle but noticeable improvement, but more importantly did not take away anything away from the m-900s performance.)