Hey Michael,
I am not a professional, but may I suggest you will put in your bag:
1) 18-200mm
2) 28-300mm
3) 10-22mm
4) 17-85mm (optional)
The first three covers almost everything you need, do you really need 3 bodies in the bag???
My bag:
1) Tokina 11-16mm/f2.8
2) Nikon 35-70mm/f2.8
3) Nikon 80-200mm/f2.8
4) D300
5) CPL filter, Softer, Cross-Star filter
6) Sigma Speedlight
7) Nikon 17-35mm/f2.8(optional since I have the 11-16mm)
