I vote jetstream as the best suitable bike from this list.
However do not forget the wheel QR on Dahons and Downtubes reduce the size alot.
The other option is a Brompton because of the rear suspension. Also consider a Dahon Curve which is a comfortable bike for distance due to Big apple tires.

However if you are doing long distance I find the Curve, and Brompton a bit of a slow drag, but comfortable.

A sprung saddle on a Mezzo may give you a fast,small folding comprimse, but it is really a commuting bike. It can be modded to be a really fast commuting/touring bike.see the upgrading a mezzo/Ori thread.