Ok, I know lots of people have asked about upgrades, but I haven't found the comparison I was looking for. I'm still getting used to my D3100, but definitely know I'm not a fan of the kit lens (18-55). I recently tried using a combo of the kit lens and a 55-200, but that wasn't a set I enjoyed so much (the images weren't as sharp as I liked them to be and didn't like having to switch). Right now I'm looking for something that will be a good all around lens I was thinking in the range of 18-140 (I'm willing to consider a good comparison on any lenses that are around this range).
I usually photograph people (adults and kids), animals, buildings, and landscapes, pretty much anything I think is shutterworthy, so I would definitely want something that is good in various lights and has pretty good speed.
Would really appreciate any advice you have to offer.