The towering turrets, the pine-swathed Carpathians, the wolves baying at the moon — what piece of real estate has creepier curb appeal than that thirteenth-century Transylvanian pile, Dracula's Castle? It's now on the market for $78 million, a price that would have even the most blood-sucking Manhattan brokers grasping for their silver crosses. But, then, those New York Realtors might well have an in with the owner: Sixty-nine-year-old Dominic von Habsburg lives in the Westchester burg of North Salem. Descended from Austro-Hungarian royalty, von Habsburg is a furniture designer living in a decidedly un-Gothic, one-floor contemporary. "My friends call it a house for easy living," says von Habsburg, who built the home a few years ago. "It's very airy, simple and full of light."