One thing to remember is that the angle of view for any lens is smaller on the D100 than it would be on a 35mm film camera. Nikon says to multiple the focal length by 1.5. Said another way, multiply the angle of view by 0.70 (rule of thumb). What that means is that a lens that has an angle of view of 100 degrees on a 35mm SLR will have an angle of about 70 degrees on the D100. Buy wide. For a standard zoom, I agree with the majority on this board that the 28-105mm f3.5-4.5D is a great lens for the money.
Note: Nikon lenses made after the advent of the D1 usually tell you the angle of view when mounted on the DSLRs. Read the documentation.