Speaker cable for 25' run flat/small for under carpet ??

I would like to change my room configuration so that I can sit further away from my speakers. This will necessitate changing out my 8' pair of Audioquest-8 bi-wires (8' long). I'll need to run them under carpeting to hide them. I hope to find a bi-wire pair 25' long that are at least as good as the Audioquests. I'd consider any/all, new/used, but "good value" would be welcome. Associated equipment:

Cary CD-303 player
Sim Audio I-5 integrated
McIntosh MR-77 tuner
Tyler Acoustics Linbrook Monitors

Many thanks!