I've been tempted by the cheap E-PM1s that are around at the moment but don't want to make a rash purchase just because they're cheap. I'm not clear what markets the three smaller PENs are aimed at. As far as I can tell, the E-PMs are the PEN minis with the least controls but the greatest pocketability. The E-Ps seem to be the enthusiast models and the E-PLs fit somewhere in between. Could someone explain the differences better? Not in terms of features but in terms of how they're each used and to whom they are each targeted.