Hey Luc,
Looking at the pics, it seems that when you are seated, all the speakers are firing "overhead". Before I would spend a dime on new speakers, I would take time to reposition ALL the speakers in the room. Once you are done that, I would re-calibrate everything with an SPL meter & Avia disc. I'm sure you will be able to unlock far more potential. Positioning is absolutely critical.

Shawn

Epic 80/600 + M3's + M3 Algonquins + M2 Computer + EP125
I think I'm developing an addiction.