"Boomers, in particular, are driving the second-home market with an eye toward both investment and future retirement. Debbie Bockhold, a certified public accountant in Orange County, Calif., and her husband, Tim, a stockbroker, plunked down $450,000 for a new vacation home -- a two-bedroom condo just 15 minutes from the Strip in Las Vegas. Does she think she may be taking a gamble on housing in the city of big bets? Not at all. With other Vegas condos going for as high as $1,000 a square foot, "the price per square foot [$280] is just a great buy," Bockhold says"