Best kind of wire for in-wall speaker wire installation?

Over the summer we will be finishing our basement (at least partially) and would like to move our Home Theater setup (5.1 Surround Sound + Buying a new HDTV) to the finished room in the basement. For cosmetic purposes, we would like to run our Surround Sound Speaker wires through the walls. I was wondering what... show more Over the summer we will be finishing our basement (at least partially) and would like to move our Home Theater setup (5.1 Surround Sound + Buying a new HDTV) to the finished room in the basement.

For cosmetic purposes, we would like to run our Surround Sound Speaker wires through the walls. I was wondering what kind of Speaker Wire I should buy? I've been reading online and I see a lot of recommendation for 16-guage, some for 14-guage/2, I really don't know what those numbers mean (except for the lower the number the thicker the wire) and I don't know what size wire is best for in-wall wiring.

Also, does Brand Name for speaker wire matter? If so, what brand names could you recommend? Is THX Certification something to aim for?

We don't really have the best quality sound system, but definitely want to leave room/capability (at least in terms of wiring) for upgraded speakers sometime in the future.

Any and all help is greatly appreciated! Thanks!!
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