Trulia.com ranked America's 50 biggest cities based on their "Rent vs. Buy Index," which compares over time the cost of renting against the cost of home ownership, including taxes, upkeep, and hiring a PI to spy on your shady neighbors.
In most cities, the index is lower than 21. That means owning costs less over the long haul. But in seven cities -- including New York, San Francisco, Portland and Kansas City -- renting is the way to go. From the KC Business Journal: