There are probably a number of answers to this question, although the in-wall wrinkle does alter the equation a bit. Lots of folks are offering in-walls these days, both traditional companies (Paradigm, B&W, ...) and internet direct (Axiom, HSU, Aperion).
I have a co-worker who has partially built a budget-conscious (or "budget-centric" considering some of the pressures he faced) system. He has been very fond of both my old Paradigm speakers and my current Outlaw speakers, but neither fit his budget at all. When we were working on it a couple years ago, I suggested HSU Research to him, and that's what he ended up getting for his fronts and center. The HB-1's and HC-1 turned out to be quite nice speakers, and I think they are a very good value. HSU now has an in-wall speaker, so he could get (4) of their in-walls and a single bookshelf (which they offer individually) or center speaker. They'd all be well matched that way, and the price would be anywhere from $720 to $750 plus shipping for four in-walls and a single bookshelf. I haven't heard the in-wall, but if it sounds comparable to the bookshelves it's a pretty solid performer for the price. Toss in an Outlaw or HSU sub for $400 to $700 and he's still under $1500 for all six speakers.
Another factor with the HSU speakers: they are pretty efficient, so powering them from a good receiver is not much of a compromise. If he split his order between Outlaw (sub) and HSU (speakers), he could get the Marantz SR5005 at the same time he ordered his sub and have his whole audio side done with those two purchases.