You could wait for the much anticipated D800 (replacement to D700) - it's been expected for about 2yrs now. Apparently, Nikon delayed all new releases after the tsunami affected production.
The D700 with it's larger pixels is appealing for Astro-work, but the newer sensors leave the old ones for dead - even H is calling it unfair to compare a 2008 vs 2011 sensor (let alone Canon vs Nikon). The rate of improvement is astonishing.
I used a D700 for a photography workshop recently. I was contemplating getting a D7000, but I'll wait for the D800 as I've spent the money on expensive glass to suit the full frame sensor, so why compromise by buying the APS sensor.
DT
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