photography monthly reviewed 5 100mm 2.8 range macro lenses, and the nikon placed fairly good. The sigma 105mm 2.8 got the highest rating, though, because of it's great optical quality and build quality, and because of the MUCH lower price. I say go with that, or get that 60 2.8 mentioned, which is an amazing lens, and would work well with a 1.5x crop.