i don't understand...you already have the 17-40... people are telling you to trade up? I mean, I have the 16-35 IS and it is a nice piece of glass, but I am not sure I would have traded in the case I had the 17-40
so use that.
If it were me, I would consider a wider prime for the granddaugher/son pages
even though you mentioned that you don't do portraits...you may make the exception for your upcoming bundle of joy. For the budget of $1000 - you can get either the 24 or 35 f1.4 of sigma which has gotten rave reviews (the 35 more than the 24, but still)
You and I have a similar kit - in regards to hardware... so here I would splurge on the fast prime.
However, I am a bit confused with you last entry - in your item list you mention that you have the 85 1.8, but then others have suggested you get it/ you aren't sure if that would push you over budget....
I must be missing something.
If you dont have the 85 1.8 despite that it is in your published lineup - I would suggest that more...
If you do, I would suggest the 35/24 1.4 as mentioned....