I'm considering selling my 18-200 VR and getting: 1) Tokina 12-24 2) Tamron 28-75 f/2.8 What do you think? A lot of my shooting (especially over the summer) is landscape photography which is why Im really wanting something wider and I think that the 28-75 would just be a great walk around lens. The longer focal distance on the 18-200 is really handy a lot though so its a tough call. I know eventually I want to get a 70-200 VR f/2.8 which would pretty much cover everything I want but I'm not sure if its worth it? What do you guys think?