I have an Eos-m and fooking love it. So small and light but still an ASP-C sized sensor. The lenses are also small and light and optically good. When exploring I either use this or my Eos 650D, which itself isn't that heavy. I loved my G10 but size matters so the Eos-m with it's larger sensor wins hands down for me.Thanks guys for all of your answers.
I unfortunately despise bridge camera's with a passion so that's a no go zone for me. Both canon and Nikon do some awesome compacts that far out perform most Bridge camera's and I'm not one for unnecessary zoom.
I'm currently looking at a Canon G series or Canon EOS M. Perhaps we can overcome focusing in dark situations by using a good torch? I'd much prefer a viewfinder to a screen I must admit. A hot shoe mount would be good, and you could use the focusing beam on a standard canon flash for focusing in low light.