I guess it depends what you want to do.
The M10 has a lovely look-and-feel (build quality and display) and a fine mic preamp - as long as you don't want phantom power. Nothing wrong with its line input but that's true of most such recorders these days. But the built in mics are for emergency use only, being closely spaced omnis. That's no way to record stereo - you won't find anyone recommending such an arrangement in the recording tech literature.
Maybe hold out a couple of months for the Zoom H2N - it may well have many of the qualities of the M10 (eg long battery life) but with much better built in mics. Biggest question mark will be over its mic input, which hopefully will be better than the hopeless one on the original H2.
http://www.samsontech.com/products/productpage.cfm?prodID=2080
I'm hopeful - the H1 had very good noise levels on its external mic input once you went above a certain recording level. Below that level it was the same as the H2.
Fingers crossed.