oh yeah, this has nothing to do with what you should buy - we just built the tool after a few beers this weekend because it seemed like it would be cool to easily visualize every car for sale in SF... hope its enjoyable!
also - we are building a comprehensive recommendation engine for the top 50-100 models by collecting everything from EPA & NHTSA safety data to style awards and max lifetime mileage. this is probably a month out and has required getting pretty creative about crawling a number of heterogeneous data sources