Cable recommandations

Hello,

Im interested in a recommendation on speaker cables new or used. My budget is is 1500. Here is what I have:

Don Sachs preamp, Don Sachs amp, Tekton Double Impacts, Mytek Brooklyn DAC II+. Bluesound Node, DIY silver speaker cable, DIY interconnects and power cord. Shuguang black treasure tubes on amp and preamp, Brimar rectifier.

Thanks