but I have to disagree on the cheap mtb ... it is an option but a cheap road bike will do you faster & better & with less effort. depends if you want to be hopping curbs all the time, but otherwise not. especially if you ride any distance.
that's true...
my general experience with people i know biking in nyc is very few people are doing more than 6 miles a day
you will def get much more miles per pedel out of a cheap road bike, but you have to be pretty crafty to avoid potholes, etc. i replaced the knobbies on my mtn bike with hybrid tires, about 1 inch wide... i feel like for city riding that is the best choice...
i did this because i was messengering and had to do a lot of stop/starting, curb hopping, taxi dodging, pot hole avoiding, as well as the long commute to and from work... especially in snow and ice, road tires don't grip the road too well...
road bikes are great if you are biking from your suburban home to your suburban office, as my old man did when he was my age... (watch out for the train tracks!), but for city commuting, they are just not as versatile and manuervabile (sp) as a mtn bike....
my feeling is very few urban bike riders can really avoid hopping curbs and potholes...