What are you envisioning with the TS17 and/or TS24? I've rented both in the past for other reasons, and they hadn't jumped anywhere near the top of my list for the cruise. Likewise, what are you envisioning with the 24/1.4? In my head, the "value" of a 24 would be wide-angle shots with the balcony railing in a corner for perspective, and at f/1.4 (or nearly so) only a small sliver will be focused, which in my head seems like a less-desirable shot than f/8 and tripod (in which case I have that covered with the 24-70, or perhaps the TS24).
I've done the intervalometer thing for time lapse, and liked the results: http://www.youtube.com/playlist?list=PL47E5215D4BA0EA1C That was done with a 40D and the 10-22 zoomed out to 10mm. For convenience of dual memory card slots and longer battery life, I'd love to pick up a used 1Ds3 and put our 16-35 on it for similar work, but that might be beyond my ability to justify between now and next summer.
Thanks all for the input, and keep it coming! I have a surprise to toss out, but I'll wait a few weeks before I peel back the lid on that.