Unless you're blowing up stuff to bigger than poster size, ya won't notice the difference between 10 and 12 MP.
I printed a 5 foot wide canvas gallery wrap with my 10 MP 40D...and I cropped the image quite a bit as well. Looked fine.
It's also the case that sometimes, due to having to pack more stuff on the same size sensor, that 12mp cameras actually have worse issues with noise than 10mp ones do.
Don't get all wrapped up in megapixels. It's a pretty meaningless specification, and really only matters in a few limited instances that most people don't even encounter (like creating posters and heavy cropping).
Picture quality out of my old 1D M1, which is only 4.2 mpixels, can look just as great as something out of a 10 or 12mp point and shoot when you're printing 8x10s and smaller, and did a good job at framing the shot in-camera.
I don't think you can really go wrong with either a canon or nikon product anywhere up and down the line. I tend to lean towards Canon because I think their glass is a bit better than Nikons in the L stuff and middle of the road lenses. The bodies are pretty much a dead heat between the two brands, IMO. That's only the SLR stuff.
I like the form factor of the elphs in the point and shoot world. I tend to carry it around more when it's small and that makes for better picture taking.
Good luck with whatever you get though!
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