In my opinion:
Bechstein = good quality high priced and poor value = don't bother
Zimmermann = 85% as good as Bechstein at 50% of the price = a bit of a bargain
Other notable Bechstein built pianos include:
W.Hoffmann which are probably built in a former Eastern European location. Bechstein are coy about this and state "European factory" for which I cynically read as "Former brown-coal works in downtown Erfurt" or similar. I've never seen a current Hoffmann, but I would not expect them to be the high quality instruments that up until recently came from the Braunschweig factory, rather a cheap Irmler-style mediocre effort.
Euterpe. The product of Samick's stake in Bechstein, so probably made in Korea or Indonesia.
Bechstein also market a cheap Chinese effort built in the Samick-Bechstein Shanghai factory called Wilh.Steinmann which is about as good as a standard Pearl River or Dongbei at a much higher price. Leave well alone - not because they're poor, but you can buy cheaper. (Wendl & Lung etc)
I have a feeling that Bechstein, once imported by Samuel's are now part of the Inter-Music empire, so a web inquiry via their site may be fruitful.
Good luck in tracking one down!