It all depends on what is more important to you and what you shoot most. If you really shoot a lot of landscapes then the 10-22 will open up a whole new world for you compared to the 28-135. As a general walk-around lens, the 24-70 or the 24-105 would be good choices. I started with a 17-40 for my 20D a few years back and then moved to the 24-105 and liked the extra tele range I had with it. Now that I primarily shoot with a 5DII, I keep the 24-105 on most of the time.


The 70-200 2.8 IS is certainly a great lens to have and if you do shoot a lot of action in low light, then its almost a necessity, but again, it all depends on your priorities right now and what you want to improve on immediately.


Good luck!