speaker cable upgrade

Should I invest approx $1200 on speaker cables for my sonus faber GPH speakers or just upgrade the speakers. I started with IC golden ref and digital cable cardas digital 15 with very good results. The current speaker cables are ps audio premier plus and upgrade will be to cardas golden ref.
Get the GR if you are happy with your speakers; it will be a worthwhile upgrade. I use it with Spendor and Gamut; I also have PS high end cables and they are good but Cardas is better.
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