Anyone have any recommendations for a tough and reliable 16-inch foldable? I'm looking for something that will last a long time, have mostly standard parts (easily maintainable), and be fairly rigid and sturdy (not crazy about suspension). It doesn't have to have a lot of gears or be fast or terribly light -- just solid and reliable. I want a 16 because I'll be taking it on the train (probably in a bag) and commuting with it. It'll probably be ridden in the rain every so often.
As for height, I'm about 5'7''.
I've ridden enough bikes (in my younger days, mostly) to know that I always regret it when I get a cheap bike that creaks or rattles or makes other suspicious noises when I crank pretty hard on it. So, I'm willing to pay for quality -- I just don't want to go overboard. It would also be nice if it could handle riding off of a curb every once in a while.
From my research here and elsewhere, it looks like three good options for me are the Downtube Mini, the Bike Friday Tikit, or one of the Brompton bikes (I like the classic look of the B). Given the substantial price difference, I'm inclined to go with the Mini, but am hesitant to go with an aluminum frame (my guess is that steel is tougher and may provide a slightly smoother ride), and am also not excited about the rear suspension. Not sure what to think about the hub gears; they seem less efficient and harder to replace than a regular derailleur setup.
Much obliged for any tips.