I have the D60 and think its a great camera, I know everyone on here thinks other wise but I have never had any problems with it and it shots great shots. Sure if money was falling out of my pants I would have $3000 camera also
But the D60 is a great camera for the price and worth buying over the D40 D40x if you are buying your first camera. And still worth looking into for an upgrade.
Also the D-lighting works as its suposed too. You will not see any diff if the the picture is exposed correctly or close to it. But if its underexposed or if you have blown out some hot spots it works great.
Just read up on each camera and buy what you can afford and not get sucked into paying for more camera then you need at the time. After all if you are buying a good camera you really never lose much if you decide to bump up and sell your old one.