Upload & Sell: Off
Yeah, my concern is the move from FX to DX... his lenses are great for, and are set up for FX... What would be his incentive for taking the deal? if he WANTS to go DX, sure, why not... otherwise, why
And like Andre said, the 24-70 isn't a great range on a DX body.
Personally, I wouldn't do it. Well, unless the D600 is an extra body, and I needed something lighter weight for travel, then I may consider.