The following dealers have very comprehensive stocks. For the 18th century I recommend Errol Manners Antiques for the 19th century I recommend David Brower Antiques, and for both 19th and 20th century I recommend Davies Antiques. Please refer to contacts for more information.
For the ultimate Meissen experience a visit to Christies on the 18th December will be something that will go down into the history books. But be warned there will be very little standing space for the Meissen sale of the century.