What a thread. I have to admit that I learned more in these few days than in all the months that I dedicated to research. Everyone, please accept my sincere gratitude.
After weighing all the arguments, I am convinced that a 700 series would be a superior choice, and it makes perfect sense to get it with a long outrigger, which naturally means the S version. With a beefy outrigger and some creature comforts like digital readouts, I would likely never need another saw in my life.
However, it will be my first slider, and, in fact, my first table saw. Many of my workflows developed around track saw, miter saw and a router. I simply don't in know advance how much of that capability I will end up using. To rebuild the whole shop around one tool, one must have faith in it becoming "the tool" -- something many people here obviously have, but will require me to walk the walk before I get there.
So I decided to take a different route. Instead of searching for middle ground, I will get myself a short stroke Hammer B3. This choice derisks my decision in few important ways. Both 1300 and 2050 mm are well received on the secondary market (I am leaning towards 1300). The 1300 xc fence combined with a 1100 outrigger should give me enough precision without being a pain to reset. There will be enough of 48" ripping in near future to figure out if I like messing with the parallel fences. Much easier to justify rewiring to move the buttons in the place where I want them. And I get to play with a moulder! Lots of fun on what I calculated to require a 8x9' footprint.
Later on, I can definitely see myself either switching to or adding a K700S to the stable. But it will be a different shop, designed from ground up to accommodate and complement a large slider.
Oh, and by the way -- Jacques, I am absolutely stealing your power feeder setup. It did not even occur to me that it can be used for long rips, and your idea to use it as a powered Jessem is plain brilliant.
Stan