you sound like you tour like we do. We actually have three cameras coming on this trip.
My husband has his 35 mm Canon Rebel with zoom lens, I have my Canon Digital, and we have given our son his first camera which is a digital as well so we can delete what doesn't work out for him.
Do you have a list of specific pictures you really want to take when you are there? Other than the obvious ones, like the castle, the walt and mickey statue, etc..