Well I'm looking to get away from my kit lens.. I'm looking at 2.. Sigma 17-70 2.8-4.5 OR Sigma 18-50 2.8 I also own a Nikon 70-300 AF VRII And I would like to pick up a Nikon 50mm 1.4.. I like the constant f2.8 on the 18-50, but then I have nothing for the 50-70 range unless I keep my kit lens. Keep in mind that I'm looking to get seriously involved in wedding photography.. Which would ya choose?