As I own speakers that cost alot less then your Khorus' my definition of cheap may be very different from yours...
That aside if its price dictating first and foremost Bear Labs produces silver cables for what appears to be a reasonable value. Others to check into would be Purenote (formerly all silver but now producing a silver/copper mix), Silver Audio, and probably the cheapest of the lot would be LAT International who produce a silver/copper "blend".
As I have only used copper to date I can't offer any opinions as to their respective ability to match your gear...
That aside if its price dictating first and foremost Bear Labs produces silver cables for what appears to be a reasonable value. Others to check into would be Purenote (formerly all silver but now producing a silver/copper mix), Silver Audio, and probably the cheapest of the lot would be LAT International who produce a silver/copper "blend".
As I have only used copper to date I can't offer any opinions as to their respective ability to match your gear...