That is what I use, as well as Van Damme Blue 4mm2 and Van Damme 6mm2 (with the clear insulation).
I can't say I notice any difference between them (or indeed QED 79-strand), but then my speaker cables are < 1 metre in length.
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http://www.ebay.co.uk/itm/12AWG-SILV...item463a9d97aa
Last ones used this.. its very good doubled up so 4 wires per side twisted and taped, not too tightly, then braided and plugs of choice. Got another one in mind and hope to have them done in a few months. Awaiting stock of this new cable
Have you tried using 15mm plumbing tubing, squashing the ends flat to go on the speaker terminals/
Good re skin effect, and you can upgrade to 22 or even 28mm tubing.