Best low cost speaker cables for my system?

24' is too long for any speaker cable, but with that in mind, you better look for something that is reasonably low in both capacitance and inductance, heavy in gauge, relatively low in nominal impedance and has some type of geometry that isn't overly sensitive to EM fields.

Too much capacitance per foot, because of the long length required, and the amp could oscillate and / or shut down at random. Too much inductance per foot, because of the long length required, and the treble response can become rolled off and dull. Too small of a gauge of wire will increase series resistance, reducing the amount of control that the amp has over the driver. Too high of a nominal impedance and you'll decrease the power transfer characteristics of the amp. Without attention to EM fields, a long run of speaker cabling could act as an antenna.

As such, the use of a 2 x 14 gauge or 2 x 12 gauge twisted pair or 4 x 16 gauge or 4 x 14 gauge spiral wrapped star quad would be best electrically and probably economically. No matter what you choose, you're never going to get "great" performance out of your system with speaker cables this length. Nor are you going to have an easy time selling such long length speaker cables on the used market, should you decide to reconfigure your system at a later date. Sean
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I have used 30' runs of both Canare 4S11 and MAS Signature Hybrid speaker cable, and my system does not have rolled of highs or radio channels playing. None of my amps...SS or tube...have ever shut down unexpectedly. I think my system sounds great, and others have thought so, too.

Try some inexpensive Canare 4S11 for $.69/foot from Markertek. If it doesn't do it for you, then consider auditioning MAS Signature Hybrid (sold by Audioparts, Inc on Audiogon) with no risk.

Great choice of components. I really like your system. IMHO you might consider to devote the money to a beefier amp with higher damping factor and just go for ordinary speaker cables (wire from the hardware store) ... your speakers can probably handle at least 200 Watts. More headroom and damping is likely to give you an audible improvement. ( I am assuming that your budget is around $1000 which is enough to do an amp upgrade)

Tvad's suggestion of Canare cabling is right on the money and a perfect example of what i was talking about. That is, it is a 4 x 14 gauge spiral wrapped star quad design. You can also find other similar products at Parts Express for slightly less money. Sean
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Sean,
Your remarks are way over my head, unfortunately. The DH Labs Q10 uses a pair of 12 guage wire and a pair of 14 guage wire within one jacket. I don't know how this compares with your suggestion of 4X14 guage "spiral wrapped star quad design".
Tvad: thanks for once again offering suggestions for my system. I will look into the Canare cabling you suggest.