Yeah, if you're set on this configuration, call Don Oatman @ LDS,
www.LowDownSound.com . He'll make you a beaut.
You pick the drivers.
If I was watching clams but still wanted a
great cab, I'd go Eminence Delta Lite II 2512s. 1000 RMS box.
http://www.usspeaker.com/delta%20lite2512II-1.htm
If I didn't need to pay as close attention to bread, I
might do two Faital Pro 12PR300s & two Eminence Kappa Lite 3012
LFs. 1500 RMS cab.
http://www.usspeaker.com/faital%20pro%2012pr300-1.htm http://www.usspeaker.com/kappalite3012lf-1.htm
Would need a crossover on this one, though, probably around 1.5kHz. The Faitals get you to 5kHz @ 99dB SPL, while the 3012LFs provide
9.1mm Xmax! Serious air movement.