I'm posting this mainly as what I would recommend for sharpening stones based on what I've tried. Othes may like different options but now I will use any extra money for knives instead of stones or strop stuff.
I've reached the point that I will no longer be buying sharpening tools (stones, strops, systems, etc.) I have 3 type stones and will probably only use two. I have DMT fine and extra-fine, Spyderco fine and UF, and Shapton glass 320, 1k, 4k, 8k bench stones. And I have the EP with a set of Shapton glass stones. For the moment I will only be using the Spyderco and Shapton glass bench stones. I love the DMT stones but don't need them. I haven't used the EP in 6 months or so but love it also so I'll keep it. In the past I have sold stuff after I don't use them for a while.
So, after trying a few different stone types I have settled with the Shapton glass for a high end water stone set. Of the other stones I've tried I love the Spyderco stones more than others. The only reason to get another stone in addition to the 3 Spyderco grits is if you want or need a coarser stone. I have that covered with the Shaptons but if I didn't have them I'd add to the Spyderco's with a coarse or extra-coarse DMT I
think. One thing that is a major advantage of the Spyderco stones is you can use them dry. No mess. Just open the box, sharpen or touch up and back in the box they go. Give them a bath once after every two uses or one extended use. In addition to that they perform great. If they didn't perform so well I wouldn't use them no matter how easy they are to use. By adding a coarser DMT you still have the dry, no mess and have a good stone for the heavier jobs.
There are tons of stones I haven't tried but unless you just want to try a bunch of different ones I think the main thing is to find good quality stones and just use them. Unless you want to spend LOTS of time sharpening having different stones around the house is money just sitting there. Unless you use them of course. But even the guys who have many, many stones seem to settle into a small set they use most.
This info may be of use to someone who is considering sharpening stones. Or not.