thats some serious cash ... check out the velodyne digital drive series
edit: just checked SRP's of the velodyne digital drive series (only the smaller diameter drivers are in your budget)
so check out these also:
axiom ep500 x 2 or a single ep600 instead
or
SVS subwoofers e.g. PC Ultra x 2 or PB-12 Ultra/2
and get yourself a Velodyne SMS-1
(just maximizing your budget)