Upload & Sell: Off
Lew -- I had the same debate last year and after going 'round and 'round in circles, I decided that nothing would be at the quality level of 5D2+L glass, so why bother trying to find a compromise. I ultimately just picked the Canon S100 because it was small and not plasticky.
I went to Costa Rica with it and proceeded to take a ton of blurry, grainy, poorly timed, and questionably composed photos like all the other tourists. It was liberating and awesome!
But you're much more of a gear head than I am, so you should totally buy some new toys to play with on the cruise. Mwahaa. Oh! You should buy Carmela a vacation camera too, but a different one from yours, so then you can try two different ones!