I've been going back and forth lately thinking about changing lenses. I would say 90% of my pictures are of my 1 y/o daughter (and I take a lot of them!). I mainly take candids, but my wife would like me to take more portrait style pictures. I also enjoy taking pictures of local wildlife (think zoo) and a little macro.
So, here is what I've been thinking...sell the 24 - 105 and do the following:
Canon 18 - 55 IS (for those times I need wide, probably 1% of the time. When I had the 28 and 85 primes only I almost always used the 85).
Canon 50 1.4 (owned in the past and loved the IQ)
Canon 70 - 200 4.0 (non IS)
This setup gives me the 18 - 200 range with a portrait lens and a great lens when she is outdoors and running around in the snow and grass. I do have the 430EX II flash that I don't mind using once in a while.
I did think about one of the tamron 2.8 lenses, but it seems like I would have to use my flash indoors no matter what to help with the focusing.
I may just keep my 24 - 105 since I love the IQ and color/contrast that I am getting with it. Wish I could just buy another lens and keep this one. 
One other option is the 18 - 55 IS, 55 - 250 IS, Sigma 30 1.4, Canon 85 1.8.

