Which are the non-x text editors in Powershell?

Vim is available as a straight-up Windows port if you prefer it. I have an older version that installed itself with batch files; that doesn't integrate into Cygwin so well, but it's workable. I haven't tried v7 yet.

I'm sure there's Emacs for Windows, but I'll let you dig that link up on your own. ;)

why not use vim with 'powershell syntax'?

A little late to the party but this editor works great from the command line.

Kinesics Text Editor http://www.turtlewar.org/projects/editor/

It also has a UI version as well.

After install you can use it at the command line by typing 'k'.