My first Housewrecker, I used four 12" JBL GT subs that I had lying around for years. Got them at circuit city long LOOONG time ago for buy 1 get one free
The box sounds awesome, even thou I rushed to build it. Now I'm going to rebuild the box again, but TAKE my time to build it.
I would suggest building on ur budget. I think you'll like the sound with cheap subs. Once you can, upgrade the subs.