OK I'm sold on interconnects, now speaker cable?

I just hooked up a pair of Audioquest Blue Racer interconnects from my Cambridge Audio 740 C to my Mcintosh MA 6500 and WHAT A DIFFERENCE!

Much better treble, and bass, and overall a richer, fuller sound. New to all this and happy to learn.

Next question is what speaker cable to move to for the B&W 683 floorstanders within the same system. Any thoughts?

Thanks,

Michael