Speed TR with 24 speed dualdrive .... or actually a regular speed Pro with an add on tour carrier would do fine....its much lighter as it doesnt have all the bells and whistles
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I think you want to have a wide spread gear ration and an easy to fold bike ....
otherwise something like this would be ok as well
http://www.thorusa.com/dahon/musltour.htm
being biased of course ....