The problem with budget gear is that it tends not to work as well in low light.
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For video work I don't see the point in AF discussions. Your preference should be for a focal length range, which works well in bars.
As a zoom I would recommend the 16-35mm f2.8 so that you are wide enough and still have some possibility to change focal lengths, but your 17-40mm should fill this role in a similar form, so there's no need to purchase anything in a hurry. Using your 24-105mm you will have plenty of flexibility towards longer focal lengths.
I wonder: How much would you be willing to swap lenses to get the better color rendering of say a 50mm f1.2?
Signed in just to comment about the iPads
Watched a lady with her brand new iPad with the built in case taking a picture of a birthday cake. She was holding primarily by the case, case released, iPad fell in cake.
I'm glad people photograph with iPad's. It's very entertaining to watch!