When I went to school for my Associates Degree half the class dropped out in the first week because the class was more than they expected. We not only learned 35mm, but medium and large format photography also.
Your D60 should be fine. If you do night photography you will probably do more long exposures and flash then high ISO. Even now with my D300 or D800 I very seldom use a high ISO for night photography. I am not saying that I don't do it, just that I don't do it enough to warrant buying another camera just for that.
Lastly some noise in a shot is exceptable or you can use noise reduction either in camera or in post production.