I bought my D90 when it launched in 2008, I used it heavily for the first couple years, but I just don't have the time to go out and take pictures like I used to, and for casual shooting I find myself using friends point and shoots instead of carrying around my big DSLR. I have the D90, kit lens, 80-200 f2.8 (hasn't been used for over a year), 50mm 1.8, and a SB-600. I'm thinking about selling my kit and getting a Olympus PEN E-P3. How much would I be sacrificing here? I'm only looking to use the kit lens, and maybe a prime. Would this be a smart move for someone looking for a smaller camera for more casual shooting?