For electric, I think PECO is pretty reasonable. I pay about $50 a month when not running ACs. But ... I also have replaced almost EVERY bulb in the house with compact florescent bulbs. But I've also got an electric water heater and electric dryer too. So I think I'm doing pretty well!
What will really hit you in the newer homes is the summer AC bill since your roof will get baked. BUT - you can really help that by installing a Radiant Barrier. This will cost you about $300 to do yourself and pay for itself in the very first year. Your home will also FEEL much more comfortable in the summer.
It can also depend on whether someone is home during the day or not.