A couple of good older Canon lenses are worth considering if you're looking at the 55-250 IS.
-The 70-210mm f/3.5-4.5 USM can be found on eBay for under $200, and sometimes for just $120 or so! This is a lens that Canon discontinued in the late 1990s (most likely to prevent competition with their newer 70-200mm f/4L). It features true ring-type USM which focuses faster than the 55-250, full time manual override, and a decently fast aperture.
-The 100-300mm f/4.5-5.6 USM is virtually identical optically to the 70-210, but trades the faster aperture for 90mm more reach.
Both of these are full-frame compatible and have better build quality than the 55-250 IS; also, both have distance scales built right in, metal lens mounts, and non-rotating front elements. If you look around on eBay, you can snatch one up for about $50 less than the price of a refurbished 55-250 IS.