@bjp9738 I had C2600/MC302. For XLRs I used Mogami and upgraded to Kimber Kable Silver Streak then KCTG. I purchased them used through Kimber on ebay.
Speaker cables I compared Blue Jean Cables to Audio Quest Rocket 33 and Kimber Kable 12TC. I preferred the Blue Jean Cables in that comparison because the Kimber Kable 12TCs had harshness in the higher frequencies and the Audio Quest Rocket 33s seemed to muffle lower frequencies. I did try the Kimber Bifocal XLs and the high frequencies were clear and the sound decay of symbols was natural and the total sound was dynamic and clear. Much higher price point than the 12TCs but in my system worth it.