I am purchasing the Klipsch 7.2 THX ultra 2 speaker system with 3 KL-650-THX and 2 KL-525-THX speakers. I am planning on mounting them on my walls. I am thinking of using the omnimount 60.0 ST-MP to mount them but I like the look of the 60.0 WA mounts but it seems they are no longer made and I have read a few reviews stating that heavier speakers tend to sag. My question is what is your experience with either of these 2 mounting systems or are you using another system (and if so, what?) Has anybody mounted them in their walls with a built-in frame and how does that affect the sound of the speakers?