Dave, you may have already made your decision, but I'll chime in anyway.
"Wait for and buy the D7100 (?) if it's announced and available between now and April."
Why? Do you honestly think this hypothetical camera will produce substantially better images than the D7000 you can get now? Sure, it may be incrementally better in some specs, but if you can't get the image with a D7000, you are unlikely to get it with a "D7100." And you'll be paying a premium for the bleeding-edge technology. Frankly, the D7000 is one of the best deals going in the camera market today.
As for new vs refurb vs used, I'd go the refurb route. You just never know what you're going to get on the used market, even in a place where the sellers are generally honest and aboveboard, like here on Nikonians. And the 90-day warranty on a refurb gives you plenty of time to wring it out and discover problems, if any.
Finally, I wouldn't worry about that D7000 unavailability rumor. The source for that is one retailer in one country, and it may be a simple data-entry error for all we know. I would be very surprised if there were a significant period of time when a top-of-the-line Nikon DX body, the D7000 or its successor, were not available.