Since it is an aps-c sensor, you will have to multiply x1'6 your focal lenght in order to know how will it look like.
For example, 100mm lens will crop the image like a 160mm one. A 35mm will crop like a 50mm...
That is the problem when you waste money in 60D/7D instead of saving for a full frame one like 6D or 5D, that you almost can't have Wide-Angle lens unless you expend a fortune.
Nevertheless, I've a 17-40mm L lens wich works nice in my aps-c (600D) and my FF one (5D MkII), try to get that lens... but I think it will be quite more expensive than £350.