If I can get a used E-P2 with kit lens for $250, or a E-PM1 with kit lens for $450. Which would you pick? I'm tempted by the E-P2, but I'm concerned about auto focus speed, and no built in flash. I have a 2 year old and 6 month old that move allot. Want to make sure I can capture the moment... I keep thinking with the $200 saved I can put towards a 45mm lens. The $200 is not a deal breaker for me so I don't mind spending it if it will give me more keepers. Thoughts?