When shopping for a house to buy, it's hard not to fantasize about the homes just out of your price range. Regardless of what you plan to spend, it's fun to imagine buying a house even bigger, nicer, and more feature filled than the ones within your reach. And, with the Internet, it's easier than ever to steal a glance inside the nicest homes in the area. In fact, you can shop real estate in any area. But, while we're all familiar with famous luxury markets such as Beverly Hills or Aspen, Colo., what are the nation's lesser-known, up-and-coming luxury markets? Well, according to a new index from the National Association of Realtors' consumer website, East Coast house hunters looking for a warm weather getaway have propelled Sarasota and Collier counties in Florida to two of the top five spots on the list of fastest growing luxury markets. Other areas that made the list include counties containing Castle Rock, Colo., San Jose, Calif., Queens N.Y., Seattle, Jersey City, and Redwood City, Calif. But, if you're planning a move to one of these hot spots, you have to move fast as they all have seen 10 to 20 percent price increases over the past year. More here.