Thanks, Bob, for your thoughts. As has subsequently happened between now and when I first posted this, I've come to the resounding conclusion that I'm better off going with the a77ii. It was fun playing with the A7 (and I admit I was drawn to that one only because of the incredible reviews it was receiving when first launched).
Ultimately, you are right -- your lens collection should pretty much drive everything else.
My A77ii arrives today. My a7 will go on eBay tomorrow!