The Helix should trump just about every other folder out there: 24" wheels should make for a smoother ride, still small enough to be nimble, can fold down in multiple ways, titanium frame, and the smallest actual fold available. In theory. Time will tell when the bikes supposedly start getting delivered in October.

I also looked at the Dahon Dash series for a long time. Kind of regret not picking one up when one of the bike stores was clearing them out.

Have you considered a Brompton?

Not sure you really need suspension in a folding bike, unless the places you go to demand such additional ability.