If you're going to be parking it in the same spot every day, you should probably think about getting a beater bike, or something that's not desireable, (though I don't know how much that has to do with it).
A lot of bikes get stolen in NYC. There was a video posted on this board about 5 weeks ago where someone used various tools, including power tools, to remove locks from (his own) bikes -- basically "staged thefts," and no passers-by said a word. If someone wants your bike, you really have no chance at keeping it, so it's probably best to use one that you won't miss if it's stolen. Leaving a desireable bike in the same general area every day is probably too tempting.
Joe.