If there's one thing television informative murder porn has taught me, it's that the cops always catch the guy who buys life insurance for his wife, if she has an unfortunate accident a week later. So, be sure wait a little longer before you off her.
When you look at a life insurance policy I always think that one should buy the amount of coverage they need then the duration of the term period you can afford 2nd. When looking at companies I think you should also know the size, rating, any accelerated benefits, and of course that the premium is truly fixed for the entire period of the term. Beware there are some carriers / products that might say 10, 15, 20 or 30 year term but when you read the contract it is not locked in for that period but rather it is 'projected level' after some period of fixed time.