I'm trying to choose one lens for now, 17-55, 24-105

[Photog82]

Sean, I skipped that lens due to it not having IS builtin; I thought for certain situations on the long end the IS would be helpful. Is that not the case? Also, read about people complaing that they have a "soft copy" of the lens... what is that nonsense?

I suppose these pros and cons could be applied to the 24-70:
Canon 24-105mm f/4L IS USM AF
Pros

* L glass
*Good focal range for landscapes, sunsets, etc
*Good replacement of the 28-135 that I own now

Cons

* f/4 which is fine for outdoor photos but not for indoor portraits
**I could use the 50 1.8 for that but it lacks zoom

Canon 24-70 2.8 I
Pros

*L Glass
*f/2.8 great for indoor photos/portraits

Cons

*Focal range on the long end is fairly short for some of my landscape shots, primarily sunrise/sets (coming from a 135, now choosing between a 105 and 70)
*Old lens, it's being replaced soon