Why not look at selling both and getting an EF-S 18-200 mm Canon lens? That also has IS. With my DX sensor Nikons this was always my first lens of choice. It is a very useful focal length zoom to have. Ask yourself - how often do I use the 250 mm length of the 55-250? It would give you most of the focal length you use now in one lens. If you look at Ken Rockwell he has some critique of it - but do not forget Ken often speaks with tongue in cheek
