With just a quick glimpse, yes, I'd use the 24's for the side surrounds, and in-ceiling for the rear surrounds. Most material these days are in 5.1, though more and more are being offered in 7.1, especially on blu-ray (even 9.1, I think, on the new Expendables, but I may be mistaken). With the size of your room, the 24's should work fine. Remember, though, from what I read, the Klipsch's typcially need some "burning in" time, to take some of the harshness out of the horns. Not being up on that much, it may be something that's been addressed and not necessary. But the prices you're looking at look pretty great!