OP-Husband and I just worked this out in our house last month.
My husband and I owe no one money (house is paid for), except for our monthly bills: taxes, electricity, food, stuff we buy, etc.
We also have a good amount of money in savings, probably 10 years living expenses.
Husband is our "big" money maker. Through his job we buy 5 times his salary--it is crazy cheap like $5 a pay period. That is the maximum we can buy.
I am pregnant with our first (due in April), and am looking to buy more life insurance on him. I am looking for an amount to completely cover the cost of college for a child and also to help cover expenses should something happen to him. I am looking at buying two policies. One a 20 year term and one a 10 year term; so as he lives longer and our savings grow we can have less insurance. I am looking at a 10 year policy of $250,000 and a 20 year $750,000. I have quotes from three large consolidator groups and all are less than $1000 per year (and he does not qualify for preferred rates); we just need to pick the policy.
I added up all our monthly expenses, and figure Social Security survivor benefits will cover most of those costs. I then took into account the growth on our savings, the payout from his office, and came up with $1 million dollars as my cushion number. This will allow me to retire, pay for college, take vacations, and not be obligated to work more than part-time (not saying I would not work full time--just want options). It will also give him life insurance redundancy should he lose his work policy.
Since we are planning for me to stay home, he felt no need to have any insurance on me. He understands he will have increased costs if I die, but is not concerned about covering the costs. His words were essentially that day care for the kid,
cannot cost more than my shopping.

Also since I have worked a full time, plus part time jobs for more than 15 years I am fully vested with Social Security--so he'd get a few peanuts a month for the kid. (He also pointed out the decreased costs of my living expenses: not needing a second car, food and healthcare for me, etc).
I have no interest in buying whole life. I prefer to invest in investments. I am only buying term as "income protection" if my husband has an untimely demise. Since the costs are so low, to me it is worth it for the peace of mind. Could I put the $1000 a year in savings instead, sure; but what happens if he dies in 5 years--I have $5000 instead of $1 million. Of course at the same time, he could live to be 100 and I could throw away 20 years of policy costs.