Bit late to the party, and it's all pretty much been said...but here's my 2p...
Personally twin sub setup is too overpowering, you'll loose the definition in your music with too much bass.
I'd be looking at spending the money you would on 2 subs on 1 top end sub.
I've always been a sucker for the Kicker Solobaric jobbies, as they're square they perform like a sub in the next size up (10" Kicker = 12" Normal)
That or the Focal sub's, which are visually beautiful!!!
Personally twin sub setup is too overpowering, you'll loose the definition in your music with too much bass.
I'd be looking at spending the money you would on 2 subs on 1 top end sub.
I've always been a sucker for the Kicker Solobaric jobbies, as they're square they perform like a sub in the next size up (10" Kicker = 12" Normal)
That or the Focal sub's, which are visually beautiful!!!