Great you finally picked up that idea again, A!

I would suggest four further companies which released many remarkable german films mainly in proper Quality and subtitled in english:

www.absolutmedien.de/
www.universumfilm.de/
www.goodmovies.de
www.edition-filmmuseum.com/

If you like (and all the others are interested!), I could prepare an own index and a short description for each of these four. 

EDIT: At the moment, I'm working on the first of the four but I must confess that I undervalued the time it takes, so it will probably last a few more weeks. Hopefully, It'll be finished in the end of October.