[Doublej]

A friend is wiring one of the rooms in his house for home theater.  What high value wire should I recommend for an in-wall install?

[Toka]

Heavy gauge (12 or 10 AWG) and plenum rated...whatever you can find.

[WGH]

Monoprice has great CL2 rated cables if you are not running through plenums
http://www.monoprice.com/products/subdepartment.asp?c_id=102&cp_id=10239

Blue Jeans cables if your friend has deep pockets

Rating guide
http://www.bluejeanscable.com/articles/inwallrating.htm

[jmc207]

I've found the Audioquest FLX 14/4 to be a smooth, detailed cable, and quite a bargain considering the performance.
http://www.onecall.com/ProductDetails.aspx?id=88213

The Kimber KWIK-12 seems to have a bit more bass but is not as open sounding.
http://www.audioadvisor.com/prodinfo.asp?number=KKKWIK

The Monster Cable S144RCL did a decent job from the midrange on up, but for some reason, didn't seem to deliver any bass in my system. Weird!
http://www.onecall.com/ProductDetails.aspx?id=10807

YMMV, and probably will, but those are my experiences over several months with the same set of speakers and electronics. I was really surprised by the differences since the construction is so similar. I need a life!

[Doublej]

I've found the Audioquest FLX 14/4 to be a smooth, detailed cable, and quite a bargain considering the performance.
http://www.onecall.com/ProductDetails.aspx?id=88213

Dumb question on the Audioquest. I take it you tie two wires together for + and two for -. Does it matter which ones?

[jmc207]

Yes, take a wire and pair it with the one opposite it for each positive and negative run. If you look at the picture on the Onecall site it would be the black/blue and red/white together. From what I've read that's how most of these 4 wire cables are to be connected. If you tie adjacent wires together it will change the electrical parameters a bit, I think rolling off the highs a touch.