I'll throw out the 24-120mm f/4 VR as a general walk around lens. The VR will help some in lower light with stationary subjects and if you are doing nightscapes, then you don't need fast, you need DOF.
I would add a 35mm fast lens as well. There is the new 35mm f/1.4G AFS or go cheaper with the 35mm f/2 AF-D.