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I've done some of these analyses myself and been shocked to see how truly awful most counsel is concerning paying off our mortgages. (You don't want to pay it down quickly! . . . But you do want to place your "extra" money--not spent on the mortgage--in a safe place . . . like, for starters, high cash value [i.e., just below the MEC line], participating, whole life insurance with a PUA rider. . . .) And then, once you have built your safe money base, you want to use the "excess" cash in your policy [beyond the safe money base] to invest in safe, cash-flowing investments that will give you at least high single- if not low double-digit returns.)
More on these other items at another time.
For now, however, check out Kim Butler's Buying Vs. Renting (A Home Buyer's Guide, Part 1).