AMX240 Audio Panel : Choosing an audio panel

While doing so, I think I found 1 error above, but one that was mentioned a few times.  I believe the GMA-350 actually has 3 switched inputs (Page 7 of their pilots guide), the catch is that there is 1 button that controls all three.  I'm trying to confirm this understanding so is anybody can verify, I'd appreciate it.  One switch may make it ackward to monitor standby from IFD #1 when don't care about #2 since it will automatically turn it on, I suppose you could set #2 to guard.

I still haven't figured which one is right for me (GMA350, AMX240 or PMA450), but I'm wondering if this would change the decision making for anybody.

I also have a single IFD540 with a KX155, our typical trip is wife in the co-pilot seat and children as passengers.  My current intercom only has All and Pilot Isolate, so my wife is always on the intercom with the kids.  She'd like to be able to also isolate from the kids, but not necessarily start listening to the radio.  We often listen to music and from various sources while flying.  Right now we are all individual directly into our headsets.  My wife would like to be able to share music with the kids while I'd be listening to something different.

I really like the monitor muting on the AMX240, but I don't believe the 240 can mute the second comm radio while the 450 and 350 can.  I think that I can get the same functionality as the 240 monitor feature by tuning that freq on the 155 and letting the audio panel mute the second comm radio and having the standby on switched channels, which I don't believe are muted.

Please correct me if I have anything inaccurate, I hate finding out post decision that the info wasn't correct.