Due to recent price changes I'm gonna narrow the lens options to just the 100-400 + TC. Not the 200-400 but close. per recent posts anyway. so that give me the 70-300L and the 100-400, at least if I make the jump. Now if I had a dollar for everyone here with the 100-400 that sold the 70-300. LOL
I started with the 70-300L and a 15-85 with a 60D for a camera body. I still have the 70-300L. I know I should sell it.. but it's only worth half what I paid for it and I got some great photos with it. I'm still trying to get my wife to try it this coming Spring when we go out to the bird rookeries here in Florida. It is much better than her 55-250 STM, though it sure weighs a lot more.
If she doesn't end up using it, I'll "loan" it to our youngest son........... again.