The eminence magnum series drivers have (seemingly) been discontinued, so you may be able to get a deal on a couple of them. They have extremely good quality and very nice motors.
Maybe the best is the JBL 2226 for sound. Also see Ciare 12.00SW, Emience Lab12; Delta 15; Magnum 15; Omega 15, B&C various drivers and maybe even the Dayton Refernce High Output 12".