For what it's worth, my reservation about the D600 was it's size also as I am currently using a D300 and love the feel and size. I was just able to hold and feel the D600/24-85 earlier this afternoon, and my reservations are now history. Yes, it is a tad bit smaller than the D300, but it is substantial enough that I would have no problem whatsoever moving over to it. As a matter of fact, I think I rather prefer the size, weight and balance of the 600! I will certainly be buying the D600 in the near future (waiting for the sensor dust issue to get some mileage on it), and possibly pairing it to start with the 24-85.