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"RE: DX(D90) to FX (D600) for an specific need- worthy?"
AFAIK the 17-55 does not have VR, so would the 70-300 VRII be an option for you?There is also the Nikon 80-200 which doesn't feature VR but is a bag load cheaper (at least in the UK). Roughly £700 v/s £1,600