Trans-Europe Expree might be the most 'influential' 70s Kraftwerk album(mostly because of 'Planet Rock' using samples from the title track) but Man Machine is their best one. It's got the strongest melodies of any of their albums and these, allied to the wonderful electronic sounds make it an absolute classic. 'Robots' and 'The Model' get the most attention but for me the best track is 'Spacelab', it's got an eerie atmosphere and like Giorgio Moroder's 'I Feel Love' is a prototype for modern day Trance.