Firstly, thanks for reminding me to update my insurance details!! I've been lucky so far!
I did consider the EF17-40mm as well but in the end went with the 24-105mm because I though that would make a better walkabout lens. If I ever find I'm looking for something wider than 24mm on a regular basis then perhaps the EF 17-40mm will be a consideration.
With my 80D I tend to stick with the EF-S 18-135mm for most subjects and find I use my EF-S10-18mm wide angle very
OK on the 24-105's maximum aperture of f/4 but I think I can live with that as I don't do a lot of low-light shooting. I'll use my EF 50mm f/1.8 and / or Sigma 150mm for portrait work of the grandchildren or at family events if I need to go wider than f/4.
Not sure if I'll look at a 70-200mm but who knows... the 5D is taking over from the 80D a bit more than I anticipated!
I'm using a Lowepro slingshot bag which I pack with whatever I need for the day but the 5D with 24-105mm pretty much fills the main compartment on it's own!
I should have gone the Olympus route like my wife, she gets her camera + 4 lenses, flash etc., in an cross-body bag that looks like an over-sized handbag so doesn't scream "expensive camera equipment".
PS here's one of my Granddaughter taken on the 5D + "plastic fantastic" @ f/2.8. She's only three and a half and doesn't stay still long, so I was lucky to get this!