Disting is definitely great for versatility, and if you're planning a bigger rack later, it can help you to know whether you need a module of a particular type (because you can use the Disting as that module, almost certainly). If you buy one, you will never need to get rid of it. But it's also a bit menu-divey, and it's impossible to remember what module is in which bank, so you need the manual at hand most of the time (or a cheatsheet). Then again, you're usually going to only set what module it's using once every few patches. Disting has a euclidean pattern generator included.
If you already have a midi controller, you might be better off using that with a midi -> CV converter than using the KB-1.
ADSRVCA looks like a very useful module, as it can be used as an LFO, and the VCA can be used separately from the envelope if you want..