There's no need for "high performance" 12 guage wires as far as SQ is concerned. Actually, I question the validity of that name.

As for special coatings, some cities require they be flame retardant. Sometimes they require teflon coating or some such. In that case, if you want to meet code, you might want to check with the city engineer but sometimes these" low voltage" apps are not affected.

And, as for ends on cables, you don't want to buy in-wall cable with ends on them. You'll most likely have them attached to wall plates on both sides.