Cable recommendation for Krell & Vandersteen

Posting for a buddy of mine...

Looking for cable recommendations (speaker cable and XLR interconnects) that mate well with Krell KAV-300i integrated, KAV-250cd/2 cd player and Vandersteen 2c speakers? Looking for the best bang for the buck, so I’m figuring used. Type of music he listens to is everything from electronic to heavy metal.

Thanks,
JSB