For me, I have the Canon EF-S 10-22mm lens for my ultra-wide shots and for my "walk around" lens I use the 24-105L and love it. It is pretty versatile, 24mm is useful for those landscape shots that 22 or less is just too wide and the 105 is great for zooming in on a sunset or another object.

I'm waiting for all of our documents to come in to see what we will be getting back for $. I'm looking at either getting a NAS for backup (we already backup data to an external drive and bluray discs [copy kept at home and at work]) or possibly the Canon 70-300L lens.