David, your selection is excellent and there's no good purpose in making minor quibbles. One point is that you termed the QS8s "rears", although you probably didn't mean that literally. Keep in mind that in a 5.1 setup they're side surrounds and should be positioned to the sides and possibly a couple of feet farther back than the seating position, so that they'll give a little rear imaging in the absence of back surround speakers in a 7.1 setup.
As to cables and wires, speaker wire can probably be bought most conveniently and inexpensively at a local source such as Home Depot. There are numerous sources for reasonably priced connecting cables, such as Cablesforless.com, MonoPrice.com and Trianglecable.com.
