Dammit, you make me want to spend the money for the x10. Yes, that's a consideration, but it isn't the major one. I've been desperately searching for a small(ish) camera to accompany - or replace - the D700 on long trips. I've even been considering a D3200/5100. Of course, they're both quite a bit larger than the compact cameras, but still small and lightweight. And I can use my existing lens stable and processing software, so workflow considerations disappear.
I've actually used a D40X (when my D200 was in the shop), and it was a pretty good substitute, but can't compete with more recent bodies in low light. The small body Nikon DSLR's are larger than the compact cameras, but image quality is great. And with a smallish lens they aren't terribly obtrusive like the larger bodies. My D40X with the 35mm f/1.8 is a pretty small package. It's only when you put a larger zoom on it that it suffers from the intrusion factor.
I even tried a micro 4/3 camera last year - and I'm selling it to a guy locally tomorrow. Nice small form factor, but it seemed like an expensive P&S that made you want to spend money building another kit.
If it sounds like I overanalyze everything, you're right. This is another case of vacation angst. I'll survive, but it's excruciating at the moment. Thanks for your input!