hehe..
Well, I obviously agree...
But we don't have any subs to market yet, still in the research phase!
And our initial launch is likely to be an XBL2 with a motor very similar to the Brahma series, not what Sandt is looking for.
I was going to suggest modelling everything up that you can get your hands on numbers for that have an underground-but-quality flavor to them, that are in the price range you are looking for...
I would include maybe the Shiva or Tempest (not quite sure what sizes you are looking for, so bear with me)...
The Dayton series from Parts Express...
Elemental has quite a few lines out now...
I can't think of others off the top of my head, I know there are lots out there.
Hell, a little local shop here swears by "virtual technologies" subs for SPL... if you really want "unheard of".
That's if companies like DD, Shocker Audio, Atomic, Treo are either too mainstream or the "good stuff" is too expensive for you... they are pretty unheard of on the streets, to those who aren't in cyberland.
But if you are in the 1500 watt range, I don't think your requirements need to be too high for a purpose built burpmobile...
You can design your enclosure so that max output is reached without risking bottoming the drivers out (of course being aware of your frequency limitations) and you can burp tons more power than RMS.