Hi, I'm on the same boat, still trying to find a good on wall speaker set, cant believe how hard it has been so far :P
One comment about the Klipsch: audition them! Klipsch uses compression/horn tweeters, and some people find them harsh, even tiresome.
Other sets you might like to take a look at:
Paradigm Millenia or Cinema
Atlantic Tech FS-3200, they have dedicated Center channel with different tweeter position
Definitive Tech Mythos line (MSRP higher than it should be?)
Definitive Tech XTR: slim (1.5") but like all slim speakers, bass is not their strength (100Hz crossover)
KEF KHT line (MSRP is high tho...) 9000s are kind of wide at 9.8" so they are harder to place than others in this list (avg ~5"W)
KEF T305 system - slim (1.4"), small, nice sound but no bass (120Hz crossover)
Axiom M22 on-wall: only complain I have find is they sound metallic, cold. Plus is they offer custom finishes to match your room/furniture.
Hope this helps