If you wait too long by then the D7100 will have released, you'll be overwhelmed by this new camera. And may have forgotten about the D600.
Unless you really want a FF so badly & just waiting for the price to drop. The price of D600 will surely drop further...
Bought a 2nd D600 on Sunday, first D600 kena 'stolen' by wifey. Suddenly just went MIA from cabinet together with the 24-120VR. Sigh...hope nothing else goes missing soon. :bsmilie:
D600 will drop in price, just as D4, D3S and D2XS and ...
If you are not in a hurry to buy, you can wait. If you want it, just buy. If you're worried on 600S coming out, then just buy the D600 replacement. You won't lose out anyway.
D2X -> D4
D3S -> D4S
D700 -> D900
D600 -> D500 (? Assumption here)
Just buy which ever you need down the road. Upgrades always comes, need, just buy. No need, is okay to wait. However, no guarantee the new replacement or upgrade comes with specs you might like (or NOT like).
Maybe D600S comes with higher buffer but no dual SD? Maybe only 1 XQD and 1 SD? Etc. I waited too long myself, when D4 was announced, I didn't grab a D3S fast enough, so no choice, have to get a D4. Now I'm non the wiser, next time D6 announced, I'll faster grab a D5(S).
Patience is good but opportunities don't drop by twice.