I have a Super Ikonta B (6x6) and really enjoy it as a 'walking around' medium format camera. Even with the rangefinder, it's still more of a guestimate the focus camera since the rangefinder is uncoupled. What are you planning on using it for (ie: landscapes, buildings, people...")? If people are the photographic game you stalk, you might be happier with a twin lens reflex. Many brands that aren't Rolleiflex (Yashica for example) will give quite pleasing results for not too large an investment, with the added bonus of more precise focusing (what you see on the ground glass is pretty much what you're gonna get). Just something to consider in the equation.

Joe