Here is what I did FWIW.
I went from RCA to XLR from phono to integrated - this was a really noticeable improvement - and I a/b tested using same brand of cable
This lowered the noise floor and boosted the SNR
I use Zavfino Fusion which is very well made solid silver/OCC copper IC and IMO a bargain for the price at $357 for 1.5m
I will probably try Acoustic Zen, Voodoo or maybe Audio Sensibility Statement Silvers at some point but this is very low priority (I replaced entry level Zavfino speaker cables with AZ Holograms which are really nice)