Yeah, Canon and Nikon really are at the top of the list when it comes to DSLR's. Olympus, Pentax and some of those are pretty close on their heels though.

It is a no brainer decision if you already have any Nikon lenses. All their film lenses from like 1996 forward are 100% compatible with their Digital cameras. The lenses dating all the way back to the 70's will work if you want them to, but that was way back in the day of manual focus! Their micro lenses are phenomenal.

Although I didn't have any Nikon film lenses I felt that Nikon really was smart in making their DSLR's fully backwards compatible with their old film lenses and that made me more comfortable that they wouldn't leave me with a handful of obsolete lenses sometime in the future like several of the other camera manufacturers did with their film lenses with the start of the digital age. It doesn't take very long to end up with more $$$ in your lenses than you have in your camera. I'm already there!