I have a Nikon D50 for 6 years, ideal DSLR for beginners in the "real" picture. Over time, the accessories have enriched: SB600 flash, remote control, zoom 70-300mm VR-II, a 35mm f1.8 with happiness. Not only D7000 kit works wonders as is (although the 18-105 VR does not seem so precise it in terms of sharpness), but I am happy to recover all D50 accessories !!
A real treat, I learn every day (the remote control of the SB600: it's great!). So no regrets