I'll start by pointing them to the STF-2 (I have the VTF-2 and like it) and back them down to a STF-1 if the 2 is too big for them.

I like the idea of the HSU system. Seems to get good reviews, others on here have heard and liked it. We'll see if they go for it.

They had wires prerun in their ceiling for the surrounds (it was new construction). I'm not sure if there will be an easy way to mount the surrounds to the ceiling in an unobtrusive fashion and take advantage of the prerun wires.