Manuel Garcia , Apr 01, 2005; 01:15 a.m.
Looks like your on the right track, however don't forget the 1.5 crop factor. I don't have the 7D, I instead opted for a new film Maxxum 7 last month. But I do have the 24-105 and it's magic on my film 7. I didn't notice any vignetting or distortion at the wide end when I used it on my Maxxum 5 and I don't expect any on my film 7.
Either one is a good choice, you didn't mention what type of shooting you will use this combo for. But the 24-105 is hard to beat if you don't need that extra speed. Good luck!