We use about 10kWh a day, a bit less during the summer, and that's a 1000 sq ft 2 bed house. Not sure how a therm relates (don't want to look it up :P) but we use zero gas in the summer.
$170 is really expensive for what you're using, I think, but that might just be New York! What is your standing charge, what is your per-kWh charge?
For comparison: Our electric bill is $50-60 of which half-ish is service charge; our gas bill is $20-ish service charge that we pay even when we use no gas.
One new fridge (small fridge/freezer), dehumidifier in the basement, computers, not much else - oh, electric for hot water, that's our biggest user.
(Edit: house is 1000 sq ft not 100! Ha)