>That is a very good point and the main reason that I have not >bought a D600. My favorite lens is my 17-55mm f2.8 DX and I >don't think the D600 kit lens is nearly as good as the >17-55mm.
Kind of tough to evaluate the two against each other IMO.
Interestingly enough, in the comparison below, the 24-85mm VR is sharper on DX than the 17-55mm, (see links below), even when the 17-55mm is stopped down. Alternately, the 17-55mm doesn't work on FX except in crop mode and doesn't have VR, so it's best place is on a DX camera where it can be a bit faster and wider but not as long.
One thing undebatable is the 17-55mm has a great build quality while the 24-85mm is a consumer lens, (though it seems quite well built in my example).