Amateurs get a raw deal when it comes to lenses .. There are the professional built-like-a-tank big, heavy and terribly expensive lenses .. and there are the cheap consumer lenses .. In-between, most lens manufacturers make some amateur lenses .. So amateur lenses are probably double the price of consumer ones, and are better built in that they are weather sealed, have full-time manual focusing, silent ultrasonic wave motors and metal mounts.
Beyond that .. Amateurs have to think of the range .. a wide angle, a standard zoom and a tele-zoom, plus a macro lens.
In full-frame an example would be the Canon 17-40 f/4 L, 24-105 f/4 IS L and 70-200 f/4 IS L. In Nikon the equivalents would be the AF-S 16-35 f/4 VR, 24-120 f/4 VR and 70-200 f/4 VR or 80-200mm ED. I would also add a 50mm f1.8 of sorts and a 100mm f2.8 macro ..
To me the main and most important lens is the walk-about 24-105/120 lens, which I use 80% of the time .. I do cityscapes, landscapes, still life and portraits.
Those who do sports, racing, or wild-life may find this setup very short or slow for them .. I envy those photographers who do only one type of photography .. like a macro hobbyist only needs a 100mm f2.8 macro .. !!