If you thought a pair of audiobahn subs were "ridiculously loud", then you haven't heard "ridiculously loud" yet.
Now you need to ask yourself. what does your system need? chrispy highs? Are your highs drowning out at high volume or distorting before you get em to where you want em?
Personally, i'd sell all that gear you got, and start over with some better quality/more resonably priced gear (not cheaper, but value wise).
Sundown, AQ, Skar, DC, AA, FI are about the only brands of subs i'd touch anymore. Then.... nevermind i'm getting off topic.
Go with the AQ tweets if those are your choices.
im getting skar vvx8s n aq750. these are going in a classic car 1973 dodge dart swinger. i dont want it to esplode with fi n what not. im going more towards sq than spl.