Buy a D600 or a D700 ?

seems pretty straightforward.  If you print large and want the best IQ you can get at the moment,get the d600.  buy from a reputable dealer in case you have a QC issue.  if you want better AF coverage/speed and/or a larger,heavier camera with more direct controls, get the d700. if you print small or not at all there is no need for 24MP.