Sigma 24-70 f2.8

You would be better off with the sigma 17-50mm 2.8 with your d3100 as its a crop sensor I had one before going full frame.
 
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I tried both sigma and Nikon versions on my d7000 before I purchased and I opted for the Nikon. Sure it costs a lot more, but it's also much better. Faster af and sharper and built to last.

However, if I wasn't planning to move to ff (which I now have) I would of gone for a 17-50 as on a crop the 24-70 isn't a great range
 
I have the Sigma 24-70 f2.8 IF EX HSM on a Canon mount. I wanted a Canon L MkI but couldn't afford it so went for the Sigma after borrowing a mates lens for about half an hour. I got it to compliment my Canon 70-200 f2.8L MkII and TBH after looking at some of the shots I've done with it I wont need to go for the Canon MkI. It's very well built, feels nice in the hand and produces some great IQ shots.

I've used it mostly on my 5D3 but it did get a few goes on my 7D and will get some time on my new 70D. I find it a very good length on a crop, but most of my shots are on the longer end rather than the short end.

The new Tamron is now getting some very good reviews but I've not had chance to try one yet. The VC on the Tamron could be a benefit to some people but I don't find it a great problem not having it on the Sigma.
 
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