Which model to buy for someone 160 cm and 180 cm tall?

Sorry to hijack this thread after all those years, but I think my question is related to it.

Do you think I can put the saddle on this Strida LT higher? See picture here:
https://drive.google.com/file/d/0B4JKD4a3F_gYczNkQWRydkh4S1k/view?usp=sharing

Or is it already in the highest position?

Thanks, Guy (Belgium)