What sort of stuff do you shoot? D600 and D7000 is pretty much the same in terms of size, build quality etc but the D600 have a full frame sensor and the d7000 is crop sensor.
thanks for the replies i was thinking of a d7000 and 70 200 2.8 in stead of the d600
or keeping my d3100 and just buy the lens or do you guys thing the d3100 isnt up to weddings i do a few portrait shot and i happy with the results