If you just want loud, for about $600, you should look at the L5's and L7's. That is their specialty.
FWIW, almost everyone Ive known that started as 'I just want it loud' grew tired of their system and moved up to more of a SQ oriented system before long.
With some of todays new drivers like the Brahma, XXX and W7, you can have your cake and eat it too. A pair of any of those would break your budget though.