I think there are some good recommendations, but nobody has stated the "Best" one yet.....
Assuming the Monster XPHPCIBIG is this same one :
http://www.amazon.com/Monster-XPHPCI.../dp/B00006345D
It says in the description:
Quote:
Same award-winning XPHP technologies now in CL3 rated jacket for in-wall use.
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If this wire is in fact already CL3 rated, I say "Use it"
No need to order more wire, unless of course you don't have enough etc..... If you don't, just order another spool for your rears etc.... I doubt mixing the speaker wire would be noticeable (I.E. Left speaker this cable, Right speaker new Bluejeans/Monoprice cable) but it wouldn't hurt to keep the L/R/C on the same kind of wire, and surrounds/rears on the same, etc.... in the event that you don't have enough of this to run in-wall.
Just verify that the XPHPCIB or whatever, is, and always has been CL3 (since Amazon's descriptions have been wrong in the past)
Save your money... you got wires