Straight techno can be boring, but there's a lot of synth- based albums that are excellent: Paul van Dyk's "Seven Ways", Leftfield's "Leftism", Headcase's "mushi mushi", Autechre's untitled album. You can have some luck with remixes. Curve's 'Chinese Burn'(song) was released as the basis of an ep/single with fantastic techno versions of the song. Basically anything Paul van Dyk remixes ist sehr gut, so just buy it. Oh, and Praga Khan of/and Lords of Acid.
