>>Quote> if you are looking for a light weight camera then I am sure the upcoming D400 will be a much much better option. >Is having an FX sensor that important then to buy an entry level FX camera rather than a semi pro DX camera ?<Quote<<<
Short answer: YES
Actually maybe, as it depends on the camera sizes and features. If the D400 has a multiselector lock and the D600 does not, that alone might sway my decision.