Bobmat,
I've broken two sets of Dahon plastic pedals already. I don't care for them. They are slippery when wet and break easily. (I just commute but sometimes I like to boot it).
I'd say go for the MKS EZY metal pedals if you don't mind the price. I got them from Harris Cyclery:
http://harriscyclery.net/itemdetails...ogId=39&id=655
They're Japanese so rather hard to find.
The nice thing about them is if you also want to go the route of clipless you can get the MKS Cube with the EZY connector and swap at will:
http://harriscyclery.net/itemdetails...gId=39&id=2268
MKS also makes metal folding pedals:
http://harriscyclery.net/itemdetails...ogId=39&id=660
But for the most part I stick to oversize BMX/downhill platforms with spikes on them. I get the ones that take a pedal wrench in addition to a hex (allen) key. I've got these on two folders and take them off with an allen key when folding. It's quick and works well. I don't fold/unfold frequently. These are much grippier and comfortable than either the plastic Dahon pedals or the MKS.
BTW if you have large feet, the MKS RR-2s are somewhat small.