Subway - I get a monthly metrocard for $76 a month.
Taxis - obviously vary by how far you are going. I can go roughly 10 blocks for $5 if I stay on the same side of town but 10 blocks and crosstown is usually abour $10.
Groceries - I am single so I spend at most $40 a week sometimes less depending on how much I ordered in.
Utilities -
Electric: typically $40 - $50 for a one bedroom (500 sq ft) apt.
Gas/Water/Sewage/Heat/Garbage: included in my place and typically included in rent (NOT AC THOUGH)
Cable/Internet: I do a package that is roughly $80 a month with taxes but most people (that I know...) use Time Warner Cable so you can check out their packages.
Various: Beware I work downtown and food is quite expensive for lunches. I typically can't get a meal for under $7. Midtown is a bit better from what I have seen the few times I have eaten up there in the last few months.