I am new here and already have lens lust issues. I really wanted to purchase a couple of nice lenses so I sold some of my other lenses and stuff to do so. I ordered a 17-55 dx and it just arrived. I had also planned on the 12-24 or 105vr. The problem is that I found a used 28-70 for just $900 and it has not come off the camera. The 28-70 covers 70% of my shooting and the 17-55 covers 73% of my shooting. So would you return the 17-55? Or sell the 28-70 or keep both? I would like to put some funds towards the 12-24 ,105vr, or 70-200vr, but I guess they could all wait for a while.