I'd be interested to see how much the D610 drops once the D750 is released.
Should be a flood of second hand units on the market after people buy the D750.
That's the way I might go in the new year.
That's what I'd like to wait for. I don't think the price for a new D610 would drop much but the used market might move some. I've had good luck with rental bodies and buying used lenses from reputable sources. Having a warranty would be nice on an expesive purchase though. Will have to wait and see.