I can't read all the above, but I can give you my opinion.
Honestly, they all are very similar, but 24-70 2.8 is my favorite. It just gives more "natural" look, even thought it has a lot of distortion present across the range(no distortion at 30mm), it is still better in that regard than 24-104, and pretty much the same as 24-70 4.
You have the 70-200, so you need not worry about the range, but if you do like to have that bit of range, 24-105 will give you that, as well as pretty good IS. It is also the cheapest by far, especially now with the price drop, it is a bargain of the century.
24-70 f4 is somewhat of a combo of those two, it is a successor to the 24-105, is sharper than 24-105, but not dramatically, and you loose that range. Also, it has annoying thing where it zooms in and out a bit as you focus, which would just make me go insane(it's not dramatic, but by 5% of the frame for example).
None of these lenses will give you that "wow" effect, but they will give you very very very good results if you get to know their weaknesses and strengths.
So, if you care about the price: 24-105, and you still get a great lens.
If you want the best IQ: 24-70 2.8. It is a great tested lens, I just love it, and version II is even better, but extremely pricey.
If you want the 24-70 2.8, and need the IS more than a stop of aperture, only then would I say go for the 24-70 4 IS.
I wanted to buy 24-70 2.8 myself, but in the end I found a great deal on 24-105 (600$), so I went with it, and have no regrets, but 24-70 2.8 is a superior lens, have no doubt.