2) Not really necessary to get spare battery unless camera is heavily used every single outing. Number of shots per charge is pretty impressive. Again, personal preference.
3) Dry cabinet... yeah ok
4) Don't most lenses come with the hood free?
5) Can just use the freebie bag first instead of buying a Crumpler AND a Kata bag
6) Buying AA batteries for flash is good idea... IF there is an external flash in the first place