Generally one lens will not do everything well. You might get by with a 16-50 and the 60-250, which are both excellent (though with possible SDM motor issues), but there are other types of photography, such as macro, that might require a specialized lens for best results.
There are a lot of choices, and many people will recommend specific lenses or series of lenses (such as the Limited primes) that cost over $1,000. Some people are happy with manual focus screw-mount lenses that can be had for under $100.
For a general purpose lens you might go with a 17-70. It is wide and long enough to cover the basics in one lens. The Pentax 55-300 is a qood-quality zoom at a reasonable price ($350). The 10-17 fisheye is really wide and give the distortion some people like and others don't.
Your use of lenses may change over time, and you can always sell the them to minimize your losses, so I would not get too hung up over them - yet.
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