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I appreciate everyones' tips.
Allan, yours' are especially plentiful and concise.
I see the spot focus not as much for BIF but BIW (Birds in Woods) or if I am "focal length deficient" but can still capture a reasonable image.
I came across someone with real world, easy to digest write up comparing the 1DIII against the 7D which helped me make my decision for the 7D.
I am sure his small test can be debated, well anything can, but seeing some real world results reassures me that I stand to benefit more from the 7D.
Except for spot focus implementation quirks on the 1DIV, I think it would be the one camera takes all for me, but just too pricey still. I never even thought about spot focus until I started using my 400mm lens with/without a 1.4x converter.
Think I'll just have keep my 5Dc until it dies, along with a 7D. I have nice EF glass, so I am excited about getting outside to shoot more pics.