I believe that vintage Agfa folders are prone to leaky bellows...but asking questions in the Medium Format forum here would clear that up. I like the square format...a nice way to see the world. Have fun!
Vaughn
I suggest keeping an eye out for a deal on a Rolleicord -- they also are fun camera to use! Perfect for use while riding pigmy ponies...
You need to be careful with leaky bellows on most folders, not just Agfa. After some research I have an Agfa Isolette III that I bought refurbed by
Jurgen Kreckel - he's known as The Man when it comes to restoring folders. You can send him an email from his site with your price range and desired rangefinder (none vs. uncoupled vs. coupled), ask what he's got, and he can tell you what he can put together for you. He also sells complete units of various kinds on eBay sometimes as the seller "certo6". Also, sometimes various folders pop up here in the classifieds - caveat emptor, but the folks here are usually pretty good about not selling something knowingly broken unless so noted.
I will also 2nd the recommend for TLRs - definitely a unique experience, and a cheap way to use a waist-level finder if you've never used one. Composing the image as both square and reversed right-to-left is also a refreshing challenge and change of pace to the usual . I have a Mamiya C330 that I'm quite happy with.
Really, there's no "wrong" answer for what camera to use. The only general advice I have is to avoid cameras from Russia/Former Soviet Union or China unless you're prepared to research all the ins and outs thoroughly (I have several FSU cameras, but if you don't know what you're looking for or who to buy from, getting a functional camera can be dicey).