As far as the driving, low end bass, that could be handled by an active subwoofer. Let's face it, even with horn loaded technology, a smallish driver can only move so much air. Why not let a 12" active sub kick in low to handle the slam and lowest octaves? I don't think it'd be that difficult to dial into your system. If you're looking for visceral impact, that's a good option in my book. Doesn't need to break the bank either...
http://emotiva.com/xref_sub12.shtm