I haven't had a chance to read the entire thread, but hope I can help. Cars are what I do for a living, literally. Plus I'm a car fanatic, race them, etc... Also have 3 kids, so we have TONS of experience with minivans. Want to clear a few things up.
First, at 85k miles (I think that's what you said you had), your Caravan should be far from having to be babied. You should get 150k miles out of it easily. However, if you want a new van because you want a new one, no arguing with that.
I'd have to double check the sales numbers, but I don't think the Honda is the best selling van, it's been the Dodge for many, many years. Nor has Honda ignored the van and relied on their reputation. In fact, the Honda is probably the best van on the market, bar none.
The Chrysler has stow and go, and the new Pacifica is a big improvement over the old Caravan, but it's still not cream of the crop. Stow and go is a neat parlor trick and if you find it useful to you, then that's your only option.
The Kia Sedona is far and away, in my opinion, the best value on the market. It's not quite up to the refinement of the Honda or Toyota, but the quality is just as good and the price is thousands less. We've had Sedona vans since 2007 and have beaten the daylights out of them. Never left us stranded, not once. Nor needed major repairs. Put 115k on the first one and 40k on the current one.
Personally, I'd go with the Kia first, then Honda or Toyota (they are both very, very well engineered and fabulous vans), then the Chrysler. Ford has the Transit Connect, which is pretty cool, but a bit smaller.
If you want an SUV because you want one, great. But they are far, far less practical than a minivan in pretty much every metric that's important to minivan owners. Unless you need to tow something heavy or need the cargo room a Suburban offers, your so much better off with a van than the Pilot, 4Runner, etc...
Hope this helps