Here are the Minolta cameras (and other useful information) for the SR mount:
http://www.rokkorfiles.com/Cameras.html

Basically that's all. There were one or two chinese cameras with this mount and the Braun SR2000 but if you want a certain quality you are stuck with Minolta.
Minolta lenses can be adapted to other cameras but since the lens register is rather small you loose infinity focus with most SLRs.

And since you are in Germany try http://www.mi-fo.de/forum/. Lots of good info there.