Chappy, that sounds like SE Michigan, where I used to live. I'm now in western PA where people have a hard time with the concept of looking across a field and seeing for miles and miles.
We get sandhill cranes here, while they can be a distance away it's not so drastic to not photograph them with either a 500 PF or the 600 PF. Our Bald Eagles are another story since most times we can't get closer than 600-700 feet of them. I'm considering getting the 1.4 TC to go along with my 600 PF for that reason. I never considered the 800 PF just due to its size and weight, and the many times I prefer to handhold.