Currently all i have as the kit lens, and a 1.8 50mm on a Rebel XT i want to buy an everyday lens, something to take everywhere. initially i was thinking of the 70-300 IS, but it is over my price range. then i pretty much desided on the 55-250 IS. the price is right , and everything i have read indicated it is a good lens. but recently i have been thinking that not having anything less then a 55 might be a hassel. i dont do much animal shooting, mainly landscape, city scape, people, e.t.c. so after looking around i found the Sigma Sigma 18-200 mm OS, it is more expensive, but i can shed the money if i am convinced. Is the sigma any good? should i just go with the 55-250, or will i regrette it.