I got my tax return and plan to use it to buy a D600 or D7100. I'm bothered by the dust/oil problem and hesitate to spend my money. Has Nikon solved the problem(s)? Should I wait a few months or go ahead and take the plunge? If I forgo the D600 I'll get the D7100. Users are reporting no dust or oil problems with that body. What bothers me the most is that my D300s purcased 2 years ago and my D700 purchased over 4 years ago have only needed a blower brush to rid the dust particles and the D600 is like my old D1x from many years ago which required regular cleaning.