Thanks everyone!
I picked up the 24-105 from Georges Cameras today. Its a great little lens.
I have seen the 11-16mm used on a full frame camera but it only works from about 14mm upwards. I bought this some time ago for my 450D purely for astro work. Should be easy enough to sell in the future
It will be another two years before I go full frame (wife will kill me if I ask for another camera 10 months after buying the last one). A happy wife is a happy life