#15. "RE: Useability of D5100 for more serious work." In response to In response to 14
I don't really think you can base the reliability and build quality of Olympus based on a P&S. The new OMD-5 is a slick camera, but it is expensive. As Leonard said, there are some advantages and disadvantages of the micro 4/3s system.
The Sony NEX series may be another alternative for a small interchangeable lens camera with a bigger sensor, but you would have to buy other lenses also.