Do you ever plan on taking the bike on the train during rush hour? If so, it might be worthwhile to go for a slightly smaller package like the Dahon Curve. If not, then the Dahons already noted are a good match for your needs. The only other suggestion I would make is that if you plan on doing any winter riding, it might be worthwhile to look for a internal geared hub model.

Oh yeah... another option might be Downtube... though I believe they all have suspension. Most people are happy with their Downtubes. The biggest thing is that it uses standard parts that are easily replaced or upgraded.

--sam