>... My head is >spinning, and I love it! The wealth of information I am >receiving from you and the others is enriching my knowledge >base and helping me to appreciate what I have and to be >reflective of my future "wants." ....
Throwing a different perspective on things.... (I have been closely following this thread - and commented on the (lack of) ease-of-use of D800 video ).
I 'upgraded' from the D300 to the D800 shortly after the D800 came out. I traded in the D300 and all my 'entry level' lenses for a 24-70 f2.8. Later I got the 70-200mm f2.8. I cannot tell you how much of my quality change was from the D800 or from the lenses, but the change has been substantial.
I am a hobby-photographer.... and I have no 'need' for the D800 (over the D300). I cannot possibly cost-justify the D800 and lenses. In fact, it's embarrassing how much I have spent on a hobby that I have to struggle to find time to do. You plan to spend $5K or so to take pictures of your grandchildren. Given that you already have good gear, this hardly makes any sense.... rationally.
But, I suggest you throw that all out of the window, and do it (assuming you can afford it). You're retired, it will give you lots to do, and it will 'step-up' your game.
Sometimes spending money on the process is enough to re-invigorate you, to motivate you, and it leads to better things *even if* you could technically accomplish similar things with what you already have. My profession is with computers, and I always have a nice keyboard and mouse, and replace them more often than I need to... but, for some things it is just a pleasure to have the best quality at hand.