Just to add to the confusion
First of all: I'm no expert when it comes to razor honing.
I started out with a Norton 4K/8K and a Spyderco UF as a finisher, and the got a DMT1200 for setting the bevel, got interested in natural stones and got a coticule and a slurry stone from Howard.
Lately I've been playing with just the DMT and the coticule, and it works well, it takes a little longer to get the razor sharp, but I find the honing process more enjoyable with the feedback of the coticule vs the Norton, so for me it seems like the Norton is on it's way out, and I've found I don't need another finisher after the coticule, yet, even though I kind of want another stone.
There is one thing though, since I started honing razors on the Norton, I learned the basics on it, and the pyramid is very valuable when it comes to learning to hone imho, if you decide to go down the coticule road, you should be aware that you'll have to invest a bit more time in learning to hone than you might have to with the Norton, but if you want a setup with the biggest width of honing possibility, and are willing to take the time to learn, I'd take the coticule route, with either the DMT1200 or the Norton 1K/4K as a first stone.
Hope this helps.