Archi,
First off, look at the older threads...many a newbie has asked this question(Doesn't mean you don't deserve an answer, tho'). Second decide what feature is most important for you. Remember that a folding bike is a compromise, so whatever feature is most important(ie. speed, portability for travelling, portability for multimode commutes, off road riding, comfort of ride, etc.) to you will most likely be the deciding factor as to which bike to buy. For example, if you're looking for a folder that is a fast, road bike kind of folder you should look at th Swifts and the lighter and faster Dahons (the speed p8 and helios come to mind). If you are looking for a multimode commuter, check out the bromptons, 16" dahons, and the downtube minis. If you want comfort, check out the Downtube FS and the Dahon Jetstream. These are just a few examples. Hope this helps,
Juan