Best "Giant Killer" Value Cables For...

I realize there may be other threads on this topic, which I haven't located yet - but, if someone can direct me to them, I would appreciate any help you can offer.

Or... in the alternative... please let me know your thoughts / experiences with the Best "Giant Killer" Value Cables to connect to a Class D Audio amp, and class d powered sub.

Looking for RCA interconnects, Speaker cables and power cable. I'm one who believes you reach "diminishing returns" very quickly with cables - so, I'm unwilling to spend a King's Ransom on cables.

That's why I'm considering Blue Jeans Cable, Better Cables, Signal Cable, maybe some others in that context.

Thanks for any help you can offer.