Since you are shooting DX, you ought to seriously consider the Tamron 28-75 f/2.8. With the perennial $25 rebate on this lens, it goes for $475 new. I just picked one up and love it. It is sharp as a tack and focuses like a champ (I have seen enough people complain about the reliability of focus to suspect that this may vary with the copy of the lens. But mine reliably focused in a club shoot that I just did where my camera was maxed out at ISO 6400, the aperture was at f/2.8 and the shutter speed varied from about 1/10s to 1/30s -- it was dark in there. The lens performed like a champ under those difficult circumstances.) It also focuses nice and close -- you can get up to about a foot away from your subject if you like. It's a really good walking around lens, and a dream for portraiture. One thing that most folks say is that it is way too soft at the edges on an FX body. So, if you are planning on moving up to that, you would probably want to plan on replacing this lens at that time. But, on a DX body, it is terrific.