I just sold my Sigma 10-20 for $450 ($50 more than I bought it for). I'm debating between upgrading to the Nikon 12-24 f/4 or giving the 105 VR Macro a try. My widest lens right now is the 28-70 so that's not very wide at all. I will likely purchase one right now and the other in a few months. I'm debating which one I want first. I'm dying to do some macro stuff, but I think I may actually need the 12-24. 28mm on a crop body isn't very wide at all Just curious what you guys think. I'm leaning towards the Macro just because I really wanna try it out. Price doesn't matter, they are both in the 600-700 range if I buy used.