So, I've settled for now on buying a used Canon 7D ($850) and a used Canon 10-22 EF-S ($600) to go with my 18-55 EF-S and 70-300 EF. With Tax that will max out my current camera savings (and I may have to throw a bit on top to make it actually fit the budget).
I'm not sure why the 7D is preferred over the 60D. 7D shoots per shots per second... but that doesn't sound like it is a factor is what you shoot save for the kids, but 5.3 per second v. 8 isn't a crazy huge difference.
You can get a used 60D in newish condition for around $600. It lacks AFMA, but for wide angle photography, it's not a big deal because you can use live view to focus on your subject, but normally shots are taken on a tripod with longer exposure times. So that is a non-factor.
As for the wide angle... I'd lean toward the Tokina 11-16. That can be found for around $530. I know people really like the 10-22... I'm not a fan of wide angle, and in the grand scheme of things, most wide angle f/2.8's are still shot at f/8 or higher... so the f/2.8 isn't a big factor. But I think there is better value in that.
So you would spend 1450 with a 7D and a 10-22. But if you get a 60D and an 11-16, you are looking at 1130 and saving $320.
With a spare $320... I'd try and sell your 18-55 for around $50 and getting up to $370. Save a few extra bucks and then get a 15-85mm for around $543 (plus tax). The quality over the 18-55 is TREMENDOUS. http://shop.usa.canon.com/webapp/wcs/stores/servlet/product_10051_10051_269486_-1