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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I've also used Kimber 8VS in the length you require and was happy with the result. There is now a 12VS offered which I would consider, however. 
Thanks to everyone for their input. Mr_hosehead, not sure what you mean by 12/2. I do get your point about standard 12 gauge, and I further assume you mean the same when referencing orange extension cord. As for fixing the ends up, and to rail2rail's point, why use any kind of termination at all? Bare wire could arguably be "better" because there is one less item (piece of material, etc.) in the circuit. I use bare wire at both the amp and speakers now.
Sorry - 12/2 is just a reference to "12 gauge/2-conductor" extension cords, that classic HD orange cord.  There are also (and maybe more prevalent today) 12/3 cords that also have that separate ground wire and connection.  The 12/2 cord is usually just a little bit more affordable and all you need for speakers.  Also, you probably would do just fine with 14/2 at your 20-25' range and save a little more.  I've used soldered spade lugs and screw-type banana plus in the past and both worked well (the soldered lugs never came undone while a couple of banana screws will probably loosen over the years).
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."