Sally,
Ken Rockwell is very good at self-publicity. However, he does things primarily to generate interest in his own site, rather than any other motive.
If you're strapped for cash, then keep the 18-55 you have. Most kit lenses are pretty good as long as you don't use them wide open at the extremes of their zoom ranges. Learn to use what you have. Stop it down a bit to get the quality up, use a tripod, take your time. This will improve your photography far more than any change of kit.
I'm no expert on the Canon lens line up, but I'd be surprised if you'd really notice that much difference between one flavour of kit lens and another.
Duncan
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