I’m not sure how much equalization is at issue here, but if you’re looking for an affordable, good sounding i/c just on the warm side I can recommend Belden 8402. Still within your budget is the very neat Z-Squared AU/AU i/c being advertised here on the 'Gon. Detailed despite being warm and very spatial. And yes, it's real AU:
https://www.audiogon.com/listings/interconnects-z2-z-squared-au-au-1m-solid-gold-rca-interconnects-2...
https://www.audiogon.com/listings/interconnects-z2-z-squared-au-au-1m-solid-gold-rca-interconnects-2...