I'm going to be purchasing a 60D body soon, and I was wondering what lens I should buy to start off with. I have 50mm 1.8 from an old Canon T70, a Nikon 50mm 1.4, and a Nikon 18-105 3.5 . I figured I could get adapters for these, but I'd really like another Canon lens that I can use for video and photography. I was thinking maybe a Sigma 30mm 1.4? Do you guys have any suggestions or inputs? I can't really spend a massive amount of money on a lens right now, so it must be somewhat on the cheaper side.