I would practice with that wonderful 50mm lens before investing in more lenses. Better lenses are great tools, but they won't magically improve your photos, and the more practice you have, the better a sense you will have as to what you want in a lens. The Canon lenses your camera guy suggested are good lenses. The Sigmas I'm not familiar with, but typically the longer the range the less likely the lens is sharp throughout the range.
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