I'm moving all my personal photography, and some of my walking-around professional work, to m4/3. I'm sort of in the same position as you -- trying to figure out if I should sell my personal Canon gear and add a few m4/3 toys tools. I'll keep the big cameras at work (no choice, they belong to my employer), but I'd love to have another m4/3 body, probably a G3, and the 7-14 to add to my GF1, 14, 20, and 45/1.8 (that 45 is awesome, btw.)
Given that I have 40D bodies, there's not a huge IQ difference except at higher ISO values, so I pretty much never take the Canon gear out anymore. (Anyone want a good deal? <g>) So for me it's a pretty easy choice to sell the Canon for the m4/3, especially because I will still have the pro gear at work. In your case, I'm not so sure. I think I'd want to have both systems, at least for now. But I suppose that depends entirely on what you shoot.
Good luck...