(CNN) - Buying wine doesn’t have to be an exercise in brow furrowing and calculated guesswork. We’ve clinked glasses with three experts to get hints for negotiating shelves around the world. Whether you're looking for a bargain-bin Riesling or top-dollar Chablis, the best merchants and producers are easy to find. Sarah Mayo, founder of consumer wine hub The Local Nose, in Singapore says: “If I only had one wine, I’d take champagne in a second. I like blanc de blancs, Grenache… I’m a Rhone Valley kind of person.