I just got a job as a second shooter (and sometimes primary shooter) for a wedding venue. This is a fast-paced environment without a lot of time for me to be switching lenses, etc. I'm looking to upgrade and purchase the canon 5d mark II and I want to know what a good all-around lense would be. If I had to to choose between the 24-70 L, Tamron 28-75 or the 70-200 2.8 IS L? I currently have a 30d that I want to use as a second body with a wide angle lense (10-22 ef). When buying the Mark II, any suggestions on where to buy it and what else to include? Battery pack? I already have a 580 EXII, 430, flash bracket and diffuser. Thanks!