I thought it was on-point, but sometimes I can get so esoteric and out into the weeds on things that I ask for a "second opinion".
>So here's what I suggest. Buy the D600. Save all receipts, >etc. Shoot it with your current gear. Find out if it will >work for you by using it on a non-paid shoot. If you don't >like it, you can sell it. You'll lose maybe $150 on the deal. > Essentially the cost of a 3 day rental. That's pretty tough >to beat.
Brilliant idea and, to be honest, makes me slap my forehead and say "duh, why didn't I think of that?"
I've got the perfect shoot for it coming up...a night-time practice I am doing to hone my skills on barrel racing shot with strobes/single-exposure. I'll find out for sure if my D200 would be able to handle it (I suspect the answer is a qualified "maybe"), except for the ISO part. So, in this case, if using my D200, image quality isn't as important as learning to get the shot, since I can borrow my boss' 7D for something like that if needed.
But for the D600, it'd be a perfect test to see how it does. As for the reselling...I wonder if Best Buy, Amazon, B&H or Adorama's policies allow for a return. B&H or Adorama could be "for credit" since I'd end up applying the money toward a D3s from there anyway (I want some sort of warranty if buying used gear).