I recommend that you read this thread: http://beeradvocate.com/community/t...strong-dark-ale-and-a-quad.12912/#post-151470 Cheers!
I recently tried Gulden Draak Ale (BSDA) and Gulden Draak 9000 (Quad) which sparked my interest. I liked the Gulden Draak 9000 a lot and definitely recommend it of you like other quads