The Nikon D3 is an amazing camera. When released it was widely considered as Nikon’s catching up and even overtaking Canon’s line of processional cameras. While its smaller cousin (the D300) shared many of its general features the D3 undoubtably was constructed to take the beating of everyday professional usage.
When released, the Nikon D300 quickly turned out to be more but an incremental upgrade to the widely popular D200.
The Nikon D80 was point of entry into DSLR photography. It served me well or the time I owned it, introducing me to the notion that the camera body typically is less of a long-term investment than the glass to along with it (and subsequently other camera bodies).