hmm...what can I say ...
Its YOUR bike You only can decide ultimately ... :-)

The Dpeed d 7 is a good bike in the Dahon stable, but after you like the melon and use it regurlary and enjoying it. I would jump one step up and get a MU P8 or Speed P 8 .... small things like carriers and or fenders ( even long mudflapps ) are easy to add to the bike later.
And you would have MUCH better components, lighter weight, etc etc if you go with the P models ( P = Premium, D = deluxe )

You probably can find a good used one too... save some money and maybe get a set of super light sexy wheels ( Pro ) and you have a real stunner ...

thor