What price range are you trying to stay in?
The Analysis Plus Theater 2 wire was a favorite of mine for a while. Good sound, didn't break the bank. If you can find a dealer that bought a lot of it, they used to give volume discounts to dealers if you bought a bunch of full rolls of it at one time. i did that and passed the savings on to my customers. There are quite a few theaters in the local area that have this wire in it
Not super detailed. But it doesn't really do anything wrong. Pretty balanced sound. Not super neutral in the sense that it has no character at all. A little dull, but balanced..... which is what you want with theater sound as most soundtracks are recorded too hot...
JPS Labs makes an in-wall speaker wire that isn't quite up to the level of their regular speaker lines. But it's close and it's not toooooo outrageously priced.
Depending on the run you need to make, using regular cables that haven't had CL3 approval certification tests run inside a conduit you stuff in the wall is potentially a possibility? I've done that a few times for some customers that wanted better stuff than typical inwall brands and were concerned about the certifications.
I personally have run a couple longer lengths of JPS Labs UltraConductor2 speaker wire for rear channels in my new place with great results. I've heard the wire Carl references on his living room system and that system sounded pretty good...