IMO the best one is the SI BM' date=' with 3/4 MDF it is only 5.5" deep and it can get very loud (louder then JL for sure) and has good SQ, and one of the best parts about it is it only needs .5cf3 to do so in the process.[/quote']
The BM is not out yet, won't be out for a good little while yet, parts are still being tooled, so no judgement can technically be made yet, except that it should provide some very nice bang for the buck as it will retail for less than $200 and is quite shallow. Going on SI's reputation it should definitely be a good sounding driver, but you can't say that yet.