There is three lenses on my wish list right now, and i cannot make up my mind which one to chose. So i am asking for a little assistance from you guys to help me decide. There is one that i am leaning towards, but im still not sure. #1 100f2.8 Macro + Kenko Ext Tube Set. #2 70-200f4L non IS #3 17-40F4L Which would you chose?