Ok, so this is the third, maybe fourth, thread you've started on this topic. To be honest (and perhaps a little blunt), this isn't about gear choice...it's about philosophy. You and your wife need to sit down and discuss 1) what you want to achieve with the pictures from this trip (momentos for a 4x6" album that will remind you of the trip as in 'ahh that gorilla was pretty cool', a coffee table book or 16x20" prints for the family room, precious memories of a once-in-a-lifetime trip, etc.); 2), what quality if images will be 'good enough' for the intended use; and 3) what her tolerance will be for you lugging the gear, changing lenses, and having the camera in front of your face for much of the time.
Once you've made those decisions, then picking gear becomes straightforward, the gear determines the bag, etc.
Just my 2¢.