Ours is 4000 sq ft (5 bdrms, 3.5 bath).
DH and I merged two houses, so our house is comfortably full, we really haven't bought any new furniture except a dining set since my old one fell apart. We pay a cleaning lady $150/month to come clean twice a month. Our utilities for everything is about $250-$300/month (this includes cable, water, internet, trash removal, A/C in the summer, heat in the winter, electricity).