Even you you "mostly settled on the Dahon", it would not hurt to look at other models (Brompton, Tikit, etc). I also 'settled' on one vendor and ended up with different one (and am happy of my choice)

Also, one important aspect that is often ignored is the 'rollability' of the bike. That is, how easy is it to roll the folded bike (as opposed to having to carry them).

Kam