Of these three, the best overall is the C925. It has the sharpest view and best contrast for me.
I also love my C11, but there are many nights where I am too tired to lug it outside. The 925 is a tick lighter (about 8 pounds) and this makes a lot of difference sometimes.
I bought the C6 as a traveling scope, then found all my trips cancelled. No biggie - I like staying at home.
Ron
-------------------- Time spent looking at the stars is added to your life.
Orion XT10i / Moonlite CR2 -- The New "Time Machine"
"Hi Def" TV-102
C925-CF SCT