Speakercraft wall-mount
http://www.speakercraft.com/our_products/new/sls/index.htm
Speakercraft in-walls
http://www.speakercraft.com/our_products/lcr/index.htm
The AimLCR1 would be a good choice. silk tweeter. fairly neutral smooth sound.
And then niles. in-wall.
http://www.nilesaudio.com/product.php?prodID=HDLCR&recordID=Home%20Theater%20Loudspeakers&categoryID=Speakers&catcdID=1&prdcdID=FG01151
I REALLY like niles If you're looking to spend more into the $300+ kinda range.
If you want to do in-wall I would go with either niles or Speakercraft. Honestly these 2 companies are the only ones worth bothering with IMHO. Alot of the others are sorta cheap knockoffs, and often ppl don't really care about sound especially seeing as the name isn't going to be plastered allover them. I sell and install custom hometheater setups quite a bit. Niles are a bit trickier to install, but have a sweet sound. Price-dependant, though that speakercraft aim LCR1 wouldn't be toobad. I don't have pricing on-hand right now, but it should be less than the in-wall you posted earlier and sound better to boot.
Also, umm. get those rear channels out behind you somewhere... If you're looking into doing the center in-wall, perhaps you might want to go with ceiling mount rears? If you've got some form of attic access or whatnot you shoudl be able to do them EASILY. This isn't an ideal as theoretically all of your speakers should be mounted head-height with the rear facing at eachother a couple of feet behind you. If you've got a 6 ot 7.1 system then those can be moved a bit forward and then rear speakers should mirror front speakers.
HOWEVER. The speakercraft AIM series helps out alot in alowing a somewhat natural surround sound without having unsightly speakers hanging off of your ceiling. They used to be WAY expensive, but this year they'e ditched normal ceilingmounts and made all of their ceiling speakers larger and aimable.
http://www.speakercraft.com/our_products/aim/aim_one.html These would match the aim1 LCR perfectly.
Of course this is ideal, and getting into spending a good deal more money, but options worth noting. The Speakercraft system goes 1 being least expensive, 5 being mroe than most would comfortably spend. Generaly there's some overlap in timbre matching, eg 1&2 both are silk tweeter setups, the higher ones are aluminum or magnesium and personally if the higher end I prefer the sound of Niles with their Tetron tweets.
Edit:
It looks like you've got vaulted ceiling, so nevermind the Ceiling mount theory. in-walls for the rear perhaps? I was asusming the length of your room was directly behind but now I see tha tit appears to be to the side of the theater area, correct? I'd be wary or atleast careful about choosing most wall-mount style speakers you'll find unless you want to buy a full set because the vast majority of wall-mounts are fairly bright with metal tweets. Thatsaid if you're looking for something like that, Klipsch has some Really nice setups that wouldn't kill the bank, come with built-in hanging mounts and sound spectacular on even low power. Again, Ti Horn tweeters mean they're kind of bright, but if you've got a movie-bias I prefer it. http://www.klipsch.com/product/product.aspx?cid=732 The cinema6 is less than a grand with a sub. take the sub out of it and you're looking at mid-600bucks The Cin 8 setup should be like 2hundred more. It seems like wall-mount ease might be a plus for you, and these don't look half-bad. The mounts pivot/swivel so you can sidewall/ceiling/backwall/stand mount them.
*L* sorry man I just LOVE helping ppl spend money, even when ther'es no direct commission involved for me.
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