Speaker Cable Questions


Opinions please:

(a) For lengths of approximately 25 feet, is 10 gauge wire preferred over 12 gauge? I suppose 10 gauge is always preferable to 12, or is it?  

(b) Everyone on this forum knows how expensive "quality" cables are. While I haven't checked extensively, I have yet to see any of these quality cables available in 25 foot lengths. if they were I would have to mortgage the house  to buy into them. So the question here is what are the "best" (somewhat subjective I know) cables at 25 foot lengths? (cost no object answers as well as costs commensurate with an Musical Fidelity M6si amp welcome).
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You can find AQ Type 8 around here and there as bulk…a great sounding cable bargain. Blacker blacks…middier mids…highs that won't kill your dog…a tone that says, "you're a wonderful person with great taste."
I have used  Blue Jeans extensively before, they are not very good cables, actually, compared to Mogami, they are pretty bad.