I laughed at Natureshot's last post
I do, in fact, spend too much time at work and too little time with the cameras! As for the "flaming"... well, I've enjoyed the give and take. And given that some of my other internet diversions include lurking (and I do mean LURKING) in some political websites, the discourse here seems positively cordial.... (well, mostly...)
I will say that I'm increasingly convinced by the 70-200/teleconverter suggestion instead of the 70-200/100-400 combo, partially because of cost savings, and partially because of how my current photographic habits play themselves out. As part of fitness resolutions, my wife and I have become disciplined about taking daily walks through our Boston neighborhoods, and so we tend to travel relatively lightly - I carry a camera/lens, and a belt pouch with several smaller lenses, and my wife carries a camera/lens. A second large lens would probably get left at home: a TC might not... (Obviously, when I go out to do more extensive and intentional landscape or architectural work, I've got a tripod and backpack with everything and the bathroom sink.)
Last thought (and not to incite an additional flame war), but Kernuak suggests I should consider filters as part of this. I'm intrigued to hear more on this, Kernuak, if you read this - what filters are you using. I have, in the past, used some graduated ND filters, and when I was a student using Tri-X and Pan-X, some red and yellow filters for the Ansel Adams-like B&W landscape effects. That said, I've also seen considerable passion expended on the "don't put any crappy filters in front of our very expensive glass" position. What filters are you using, and how do you integrate them into your work, instead of digital post-processing?
Again, many thanks to all who've commented. Oh, and feel better soon, Natureshots...