I would stay away from the D60 just because it is going to be discontinued soon. The value of a camera seems to drop a lot once it is discontinued.
The D3000 is replacing the D40 and D60, while the D5000 is replacing the D90. If you do decided to go with Nikon, I would go with the D5000 because it doesn't cost that much more than the D3000.
I think Nikon is changing the naming system for the low-end DSLR just to be consistent throughout the product line. Now it totally makes sense. The more digits on the model name, the lower grade it is. With D3x being the big brother. Now, only if Canon can do the same....
