Five isn't fair, because I can't go around the world, but... Orval--If I have to pick one Belgian, this is the one. Trappist. Almost singularly unique, yet a great representative. Old Rasputin--There are better dark strong brews from various styles. But OR is just simple, straight, and accessible. Sierra Nevada Pale Ale--Others have said it much better than I would. Weihenstephaner Festbier--I can't leave Germany off of the list. Festbiers are my favorite German style, because they have some heft but are still lively. This is my favorite of the style. Green Flash West Coast IPA--We need a hoppy IPA. This is decidedly West Coast, without ripping your head off.