Do you know if you have presta or schrader valves on your tires? I have schrader currently and have a topeak mountain morph (it can do presta with some adjustments, or you can get the road morph which comes set up for presta). Don't know if that'll fit on your folder or if it's too big, but I like that it has a gauge and a foot peg that folds out so you can pump it as if it were a normal floor pump. Also having a hose is a nice thing. I wouldn't recommend (or any frame/mini pump) as your only pump (floor pumps at home are a good idea), but it's better than some smaller ones if you choose to only have one pump.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"