If I was starting out from scratch all over - my advice is buy a 6x9 folder as you would another lens - because at the end of the day, the lens is the most important feature on these cameras.
My preference would be to have a RF apparatus built into the camera as well.
Best of the easy to stow 6x9 folders is the Zeiss Ikon Mess-Ikonta. Simple, well-built, uncomplicated-uncoupled RF and a gorgeous lens, either a Novar or Tessar.
http://www.elekm.net/pages/cameras/ikonta524-2.htm
The same camera without an RF, therefore scale focusing came was called an Ikonta C - the best of which were the immediate post-war 521/2, but there is a later 523/2 version of the camera, which is styled like the Mess-Ikonta.
The Ikonta C had an East German version called the Ercona and Ercona II. If you ever see the latter in good condition for under $150 USD - buy it. Remember - it is the lens that makes you want to use these cameras again and again unless the camera's ergonomics really get in the way.
I've left out my Agfa Records, because everyone of them need bellows and servicing.
The post-war Voigtlander Bessa with a Skopar is good, but it just isn't built as well the Ikontas. Now a Bessa II is worth having - but that may exceed the current budget limitations. I'm keeping mine only because the Heliar.