Here is another budget option. from roadbikeoutlet.com for just $250. I have been tempted to buy one a number of times. There very few user reviews and who knows how exactly it is sized, but its worth a look.

http://www.roadbikeoutlet.com/comfor...e-gazelle.html

My Bikes Direct mini Velo is the favorite bike I own and I like it better than any of the folders I have owned as well. The only stock parts I replaced was the seat post because I had a nicer one laying around and of course the saddle although the one that came on it was too bad for my butt. I am not picky though but everything has performed pretty well for me I'd buy it again and have considered buying another one a number of times. I am holding out for now to see if they offer something different from BD in the mini velo line. They seem to be having no problem moving the Nano so I am hopeful.