I have AHEM 117 albums! Where to start? Jeez. They did change their sound from Krautrock and some of their early work is stunning: Alpha Centurai, Phaedra and Force Majeure are standouts from the 70's. Thief OST, Poland and Underwater Sunlight from the 80's. Melrose and Rockoon from the 90's should set you out on their way. I did a 2 part comp a while back on the beginner's sharing thread and the links are obviously down I can sort the comp back out for you if you like.
http://www.musicbanter.com/soundtrac...tml#post764230