I'm trying to decide between the Pioneer VSX D914, D912 or the VSX D814 receiver but I need to know if paying the extra bucks for the automatic MCACC (D914) better than manual calibration system (D814)? I know it's a matter of taste but I don't know if I have the "ear" to set the tones from each speaker. I think I'd rather have the receiver accomplish this automatically. One more question. I notice the D912 has the door and the D914 doesn't not. Has it been a problem for users in the past breaking the latch on the door panel on the D912?