Yes, those mentioned by griffina are surely great zoom lenses. i am thinking that coming from a xs and kit lens you were probably looking for something more affordable than the 2 L or pro series lenses mentioned.
many people add the 55-250 IS as their first zoom lens to compliment their kit lens. it is small and light and sharp for the price.
the next step up would be the 70-300 IS, this adds USM or faster focusing, you get longer range and a sturdier build.