speaker recomendations
not that i can be of much help in your speaker selection but im going through the same process you are. just seems like no one installs in wall speakers, and even less can recommend a good set.
i can tell you NOT to get the polk 55's, they sound terrible, however the 65's sound nice. havent had a chance to hear the 265's yet.
i heard some niles in-wall, they are pricey, but also sound good. a few people have recommended these to me, so im probably going to go with them, i found a vender that will sell a set (4 surronds and 1 center) for 1250 bucks. thats about 300 more then the polks, 5 -65's and 1-265..
check out "cult of the infinitely baffled" for your subwoofer, this is what im going to do, its the best bass for the money, and if youre building the basement, you shouldnt have any problems building an enclosure for the 15" woofers. i have a strick budget to work with for my set up, and spending 1250 bucks on the in wall speakers really hurt my options for a nice sub, thankfully with much research, i found that website...
hope this helps, james