Having kids to photograph and wishing to not miss anything makes this wholly different.
Unless you have a critical need for a second body now, I'd hold off and wait for this winter. Hopefully, prices will drop to that level again, or at least close to it. You could always get the 400 or 200-400 first. With those big lenses, no one will realize a second body dangling off the end of it!
For everydays shooting, I'm good with one body. For my daughter school events + others activities, I feel I missing alot of close-up shots for not having 2nd body.
For exp. my 4yrs daughter will graduate from pre-school next fri . All students will be singing and dancing etc....having 2nd body for these moments is very handy.
I don't want to pay another $3200 for a camera that don't use much - hate that
It's nice to have another 5D III though - this camera is just PERFECT for my needs. Will see
I would definitely get a second 5D3.