Not very rational, was it? I guess I just got caught up in the emotional aspect of it.
As it turns out, I think it was the right choice. I found some raw files today that confirm the 5D3 still has a significant temporal FPN problem:
http://www.kleptography.com/dl/5diii/raw/02.cr2
http://www.kleptography.com/dl/5diii/raw/
They will open in rawdigger.