Just use Canare 4S11 "star quad" cable. It's the equivalent of approximately 11AWG cable and is available for 69 cents/foot at Markertek. Then you put whatever connectors you prefer (banana or spades) on the end and you're done. Even with exotic ends, you can do both cables for well under $100.

There are folks on Ebay that will build custom length speaker cables using Canare cable, but it will cost more.

Also, Canare microphone cable makes outstanding audio interconnect cabling.

Cheers,