I'm still reading and learning on the subject, but found this from the empirical audio site (thanks, audioengr):
"Cables that connect power amplifiers to loudspeakers are in a low-impedance environment. Amplifier ouput impedances are on the order of .2 ohms for solid-state and 3 ohms for some tube amplifiers. Most speaker impedances vary
significantly, deviating from their published impedance by as much as 30 ohms.
Typical numbers are 3-4 ohms at low-frequencies and 30-50 ohms at midrange and tweeter frequencies. Speaker cables transfer power to the speakers and the currents can be high at times, approaching 20 or 30 amperes in some systems.
The requirement for power transfer means that the resistance and inductance must be low, similar to AC power transmission systems. Capacitance is of less concern since the drivers are very low impedance."
I only note that because of your posted concern about speaker cable capacitance, you may have already considered the above.
All that being said, several recording studios I've worked in recently have gone to the same cable for their control room monitoring needs - Canare star quad 4s11. Far less expensive than $10/foot, don't know if that would be something you'd want to consider or not.