I agree, the 18-55mm is a great little lens, and is complemented well by the 55-200mm or the 55-300mm.
If you feel the need not to need such a long reach, but still a more everyday lens, then the 18-105mm may make a suitable alternative.
I'mm looking at complimenting my lens collection with this midrange walk about lens.
The other options include the 16-85mm, 18-200mm or 18-300mm, all of which come with a heftier price tag