You live in Miami so I think you should get the Citizen! I got a GreenZone two months ago and am happy with it. It was cheaper than the Miami ($ 200 new) and it was steel. Also when I was shopping around I saw a lot of used Citizens for sale. One person admitted that they did not like the ride. I test rode one and did not detect anything amiss, but there were a lot of used ones for sale which gave me pause. I test rode the Brompton, but it was way too expensive. I also heard that the folding joint on Dahons are prone to trouble. So I bought the GreenZone and so far am quite happy. I am thinking of taking it on a credit card tour from Buffalo NY to Montreal Quebec. I will add bar ends so I have a few more hand positions.

You may want to check out the "Folders" bike forum. We deal with all sorts of issues like commuting, repairs and tourding. I would never have heard of the GreenZone without that forum.