Depends upon where you will live.

I live in Montana. 80k would seriously be comfortable living here for a family of four. We have a family of seven and live on less annually than 80k. There is public transportation within city limits. Your power/electric bill ranges from $70.00 a month up to $175.00 a month depending on the size of your home. Fuel prices are constantly rising and as of 06/17/08 the cheapest fuel is 3.99 per gallon. Food is about the same here as it is throughout the US however the price of automobiles tend to be a bit higher.

The cost of our phone includes our high speed internet for $75.00 a month but this does not include long distance.

cost of health care isn't to bad through my husband's employment, but typically it is expensive here. For family he is currently paying 100.00 per month and his medical insurance covers 80% of his medical cost and prescriptions. This does not include vision or dental.

Cost of housing is rather expensive. For a nice 3 bedroom 1 1/2 bathroom (which means you have two rooms with a toilet in each room but only one tub/shower) runs about 1500.00 a month and pets are not usually allowed.

Public transportation (where I am) usually ends around 7 pm at night and doesn't start back up again until around 6 the next morning. If you do not have your own vehicle then you must rely on a bike or taxi service. Cost of taxi (last I rode) was nearly 4 dollars per person with a minimum fee of 11.00.

I hope this helps some.
Best wishes