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Jamie Ahn left the stock market to open Acqua Beauty Bar in 2000. Now she marries the spa aesthetics with finance-world sensibilities in Townhouse Spa. The swank midtown space has three floors: one for men, one for women and one for mingling. Guests are encouraged to stay late and bring their laptops, and the space's Phoenix Suite is even outfitted with a projector—it doubles as a conference room. Consider a facial (basic, $110) or massage (basic, $135) R & D for your next deal.