As much as there are many terrific places for chocolate in BRU, for the serious chocoholic a special trip to Bruges for a day or more is well worth it. Of course, in BRU you have multiple outlets of each of the main "corporate" producers, (Godiva--much better indeed in Belgium than in the US; Leonidas--for me a step up from Belgian Godiva; and Neuhaus--for me the best of the "corporate" chocolatiers). There are also many smaller producers with great products in BRU.
However, in Bruges, you have several small producers which seem to offer the utmost in variety and freshness. My two favorites are Dumon (mentioned above), and, my favorite chocolatier I have ever encountered--The Chocolate Line (
http://www.thechocolateline.be). They have an enormous variety of pralines in exotic flavors such as hot chili (it's great!), all of which I believe are handmade daily. Unfortunately, like Dumon, they also don't ship their chocolate, so you have to go to Bruges. But if you're serious about chocolate it's worth the trip--not to mention the town itself is beautiful and worth seeing on its own merits. There are several great, inexpensive restaurants in Bruges as well!