I just got back from a 2 week vacation in Israel with my family. It took me hours to agonize over what camera gear I was going to take. I finally settled on a R-D1 with a tri-elmar and a 35mm f1.4 Leica lens. I also took an Xpan with a 45mm and 30mm lens. I figured the Xpan, which is a film camera that takes both panaoramic and standard 35mm formats, would be a good backup if the R-D1 broke. I usually also take a P&S digital camera for my family to use but didn't on this trip, mostly because I didn't feel like carrying the extra charger for it.
Here is my evaluation of the selection after shooting for 2 weeks: The R-D1 worked fine with no problems whatsoever. I deffinitely needed two batteries almost every day ( I had brought 3). The tri-elmar (28-35-50) would have sufficed for over 99% of my photos, especially since in the dark it's so easy to bump the speed of a digital camera to 1600. So, I would judge the fast 35mm lens I took to have been unnecessary, and I probably will only take a tri-elmar, and perhaps a 21mm lens next time.
The Xpan worked great for panoramics, and I never needed to use it in its standrad 35mm mode. The 30mm lens was superfluous for this trip, and I never used it. Probably wouldn't take it again.
What I missed most was not having my digital P&S. Not for me, but for my wife and daughter to use. They have no interest in or ability to use my manual cameras and they missed alot of great shots of me (!), since they were unable to operate my rangefinders. I won't make that mistake again.
/T