Best all around lens for XTi

[d4a2n0k]

Hi All,

Im in the market for a new all around lens for my Rebel XTi. Right now I have the 18-55 kit lens and the 100mm Macro. I'm looking for a replacement for the kit lens which really isnt cutting it. Something that will do better in low light.

I am looking at the EF-S 17-55mm f/2.8 IS USM and the EF 24-70mm f/2.8L USM. Being both of these lenses are not cheap, I want to make sure I make the right decision. I like the IS on the 17-55 and heard the glass is excellent even though its not an "L" lens. Does IS make that much of a difference? Am I better off skipping the IS and getting the better glass on the 24-70? To throw things off here, I was also looking at the EF 24-105mm f/4L IS USM but figured the other two lenses would be better in lower light situations although this lens would give me a wider range. Im really confused.

I basically want a great lens for around the house and for taking pics of my new baby and my tank. Something that will stay on the camera most of the time.

Any suggestions or first hand experience with any of the above lenses would be great.

Thanks