Kim Noel , Aug 07, 2006; 02:35 p.m.
I have the 30D and the 24-70mm. I LOVE IT! I was a bit back and forth before my purchase as well, but decided I wanted the 2.8 for both the low light and depth of field (expecially for dim lit receptions). This is my primary lens. I also have the 70-200 2.8L IS, which goes on my second body, but I only take a handleful of pics with it. I've never tried the 24-105 but I love the 24-70. Good luck!