elemental designs k series will woop the w3. in both sq and spl. the new e8a sub is what i was thinking of if you wanted to keep the stock setup. 450w rms 900w max, flat piston cone, i mean this 8" is incredible. that thing will rock you in more ways than one. i'm thinking of gettin 2 12 or 2 15. i'll prolly stick to the 2 12 setup. goin with ED K or O series once the new 2004 series comes out. most likely gonna do the K series cuz it's cheaper, but if i some how find some more money, then its gonna be the O series. i'm definately gonna go with the ED nine.1 amp, 1009 watts rms at 1 ohm. thats my future setup.