You know I think most of us on this forum are not really bird and wildlife, sports action, etc types of photogs and that is the kind of photographer that NEEDS the DX camera body (unless they are just filthy rich and can afford the fast long lenses)...I'm not saying everyone on the forum because there are a few wildlife sports action type folks eg. Sam, Kim20, Pierro, and then there are the cross pollinators who do a little bit of everything...
I sort of feel if you are making shots of people, cars, trains, waterfalls, buildings, etc then FX is the way to go because most of that stuff is made with the normal and wide and short tele lens...
I sincerely hope the 600 comes in at that price because if it does it is going to be hard to pass it up...at least for me...