Hey guys, finally made the jump to full frame. Now I need to deal with swapping my old lenses for ones that will work on the FF camera.

Right now I have:

Tamron 17-50 2.8
Canon 10-22

(and 50 1.8 and 70-200 2.8 IS but those aren't going anywhere)

I have been looking for a Canon 17-40 to replace the 10-22 but am a little stuck when it comes to what to replace the 17-50 with.

Here is what I'm considering (all prices are used):

Canon 24-70 2.8 (~$1000)
Tamron 28-75 2.8 (~$350)
Sigma 24-70 2.8 HSM (~$650)

Right now I am leaning towards the Sigma because of the lower price and lighter weight compared to the canon as well as what seems to be better center sharpness.

Anyone have any insight here? (sample photos appreciated)