Well what are you going to do with it and why arenīt you satisfied with your Chosera 10k?

Are you looking for a natural to sharpen/finish your tools or are you in for a ultra finisher for your razors that makes shaves smoother than from your Chosera 10k?

The Chosera 10k is a very nice stone for tools, especially. It is hard and very fine. And it cuts very quickly
wich is a good thing for tools with wider bevels. But for razors (thatīs my personal opinion) it is a bit harsh.
It takes either a nice polishing paste on a strop or a nicer finishing stone.

Finishing stones for razor (ultra finishing stones that is) are usually very hard and very slow.
Too slow for tools with wider bevels and hardly adequate. I never finish any of my tools and kitchen knives
on anything finer than my Naniwa Superstone 10.000. Only if I need real smoothness (like in my face) I grab my ultra nice
Nakayama, Shoubudani or Shapton 30.000 (<- all unnecessary ultra finishers).

A nice stone for finishing your tools would be an Ohira or a mid-fine range stone.
Maksim over at JNS carries nice prepolishers.

He also carries some very good ultra finishers for your razors, like razor sized Ozukus that would fall into your budget