Looks like we have no ICE boffins here :-( shame...
Oh well.. I would not use any subs other than Pioneer and RE audio, and maybe a few others... but 3004spl is a great budget sub, the RE's though are just serious kit. Massive excursion, power, and sound quality... you'll never see anything quite like an XXX or MT.
Driven by RE's own sub, and a JBL 74.5 (or something) for your Focal, Rainbow, RE audio, etc front components...
Thats then some serious kit... stay away from Sony subs, legacy, lanzar, or any other cheap crap.