i was in a similar predicament last year, trying decide whether to live in Dallas, TX, or NYC.
Not sure if you are aware, but not only does NY have state income tax, they also have city income tax. So that is another 4-5% that you lose off the top before any other considerations (for me it was 9-10%, since Texas does not have state income tax). Living in Manhattan is pretty unreasonable, unless you are willing to live in the bad parts of Manhattan way up north. Even there, it could still run you $1500/month for a 1 BR. My friend has a studio in Chinatown for $1200, but it is VERY small and isnt that nice, etc.
Consider looking in western side of Queens, which is the closest to Manhattan. You can find a decent 1 BR for $1000/month or so, and the subway will take you into Manhattan pretty quickly.
Another choice is to live in NJ. Hoboken is a very nice area, and the PATH trains there will take you into the city within a few minutes as well.