Without any doubt, I say on-wall speakers on the outside of each window. Axiom M2, M3 or M5OW would work well. I find it difficult in my living room to decide between M2 and M5. I have both and switch between them to keep things interesting. While I've never heard M3OW, I have the bookshelves and really like their retroish, mellow sound.
If you had answered that you'd listen from the couch, I'd have told you to not even bother with speakers.
P.S. I also have M50, LFR1100 active and used to have M80 and M100. | 
