Sophy's Cambodian and Thai Cuisine has moved a bit. It's still in Long Beach, but no longer on Anaheim Street. It now has more spacious quarters on the southern slope of Signal Hill. Those who come upon the restaurant's elegant premises for the first time won't need a dose of history to be charmed. The low-slung building on the south side of Pacific Coast Highway at Coronado Avenue was most recently a Chinese buffet, and for many years was a successful bar and dance hall. When you see the new Sophy's, with huge floor-to-ceiling windows open to the street, intimate booths against those windows, family-sized tables farther down, and simple Asian decorations and gentle lighting, you may wonder that the restaurant has ever been anything else but Sophy's. Sophy's has the kind of elegance and look that makes it a perfect place for celebrations and a menu made for culinary exploration. It is the kind of restaurant you can take out-of-town visitors to: fancy, inexpensive and a showplace for the cultural mix that is Long Beach.