Yeah right! I just received my Sigma 18-50 2.8 and Sigma 70-200 2.8. So the lens lust was taken care of for as long as it took to un-pack them. Now I need more that the 200. So tell me what to do. Will I be satisfied with the teleconverter (1.4 or 2). Or should I go ahead and start looking for something in the 400 to 500 range.