I recently heard a pair of Brines Acoustics FT1600 Mk II's. These were manufactured speakers that retailed for $900 plus shipping. They are also available as 'flats' (precut cablinet sections ready for gluing) and pre-assembled cabinets or just the plans for far less. They are a single driver design and sound as good as anything I have ever heard. I just ordered the flats. They are also very efficient. Too good not to look into.
http://www.geocities.com/rbrines1/
Paul
http://www.geocities.com/rbrines1/
Paul