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I feel that 79 strand OFC or at a push 500 stand OFC type will be more than good enough for your C326BEE amplifier and Silver RX6 speakers. Fwiw, i also only use 79 & 500 strand speaker cables with Monitor Audio's Platinium PL200 and PL300 speakers.
When I was shopping in Hifi store the assistant told me Monitor Audio had left him a reel of Monitor Audio Pureflow silver cable. This appears to be the same cable used internally in their recent speakers. I've been using the cable to bi-wire GX50 from a Cyrus 8xpdQX for over a year and it is very good.