My advice is generally to depend on large-aperture, single focal length lenses indoors and let the zooms run wild where they do best: outdoors. I've never met a photographer who shoots indoors who was sorry that he owned a single focal length 24-, 28, 35-, or 50mm f/2; an 85 mm f/1.8-2 ; or a 100-105 mm f/2.8 lens. Another advantage of the single focal length: less probable distortion than a zoom lens.
So I'd suggest that anyone buying his first good SLR should stay away from the zooms and buy a 50mm lens. Today, 50 mm lenses of f/1.7 or f/1.8 aperture are surprisingly inexpensive. Do you need an f/1.4? I've seldom taken a picture at f/1.4 that couldn't have been done just about as handily at f/1.8. And f/1.4 lenses are usually not as sharp as f/1.8 and f/1.4 lenses are far more expensive.