You have $100 extra per month. Should you pay off your mortgage early or invest?
Two answers:

1. Invest (Consumer Reports)
2. Run the numbers (Get Rich Slowly)
The key thing here is to actually do an analysis, as opposed to throwing around hand-wavy arguments like “Renting is throwing your money down the toilet” and “Leverage always makes you money.” If you make a financial decision that will cost you hundreds of thousands of dollars without doing real math on a spreadsheet, then you are a moron. In fact, it should be so hard that you have to get help from other people.
Note: I also keep a list of real-estate bookmarks here.

