Michael --
There are basically two reasons for life insurance (with reason number two possibly subdivided into parts A and B ).
1. People depend on your earnings for their support. This includes spouse (mortgage and car payments), and children (living expenses 'til self-supporting years, college/other educational costs). Even after kids are out of college, if your spouse can't afford the mortgage payments alone, there is a need for insurance. For this purpose, term is the best bang for your buck. Even if the term you got years ago has run out, chances are you can replace that with a new term (and probably for a shorter term! - the kids will be done with school in way less than 20 years, yes?) for a fraction of the cost of whole life.
2. Estate management. Depending on the size of your estate and cash reserves, this could split to include final expenses. Small estate, low cash --> small whole life for final medical and funeral/cemetery costs. Bigger estate, especially if non-liquid (like a business or farm) --> enough to pay projected estate taxes. In the middle --> some folks use whole life as a means of leaving an inheritance to their kids that they could not otherwise manage to scrape together. (One agent I knew years ago sold lots of WL policies to folks who wanted to leave their kids a million dollars but knew they could never save that amount.)
So the first thing to think of is WHY you want/need the coverage. That will tell you what kind you need.
Then you need to think amount.
Assuming living costs -- how much to pay off that mortgage, and send the remaining kids to state (or private) schools? That's what you want to get. Maybe round up a bit for final expenses.
If estate planning or leaving an inheritance - that's a whole separate discussion, which should include an estate attorney, a financial planner, and an insurance agent. Don't forget to include consideration of long term care costs - those can kill an otherwise sound plan faster than you can say "Bob's your uncle."
Good luck!