What driver/kit were you thinking of?
I was looking at the Trio 12 kit. Seems like quality components. Even though that sub is their 'budget' version it seems like it would do ok in that kit with the amp tweaks.
I just need better low range extension than what I'm getting with the BIC F12. Looking at the SPL pdf on the site I'm thinking I should be able to get decent response at 20hz...not stellar, but decent.
I do have space for their SDX15 driver and am trying to figure out WINISD to get a good design.