Used cables $1k - SF Amati and Bel Canto RF1000??

I've a $1k budget for used 1m XLR interconnect and 3 or 4m speaker cables.
Currently fighting brightness with temp Supra EFF-I interconnect and Canare 4S11 speaker cables.
Any suggestions for a warm, rich and full sound without losing too much space, air and accuracy?

Thanks, as always...